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Questions tagged [alloy]

For questions about alloys.

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10
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3answers
2k views

How can steel be so different from iron, even if amount of carbon is small?

Perhaps I am too naive, but I am having a hard time visualizing how even 'high-carbon' iron and steel alloys are maybe, at most, about four percent carbon by mass, which still means only one (smaller) ...
2
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0answers
28 views

Can an alloy catalyst change during a reaction?

I am studying the reaction pathway of oxygen evolution reaction (OER) on a PtNi alloy catalyst using density functional theory (DFT). What I found is that, for different intermediates, the most stable ...
0
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1answer
41 views

What can happen to overheated aluminum cookware?

I accidentally overheated an aluminum espresso maker, to around 250-300° C in my estimation, but it might be even higher - I didn't measure, though. After research, I found that the material used is ...
7
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2answers
800 views

How to separate Cu and Ni from alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn < 5%)?

I have an alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn, Ag, Si in small amount < 5%). How can I separate Cu and Ni from this alloy? I tried to dissolve alloy in sulfuric acid, ...
0
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1answer
41 views

How to dissolve brass surrounded by aluminium?

I have a broken off brass needle stuck in a caste aluminum hole. (It’s the pilot mixture jet on a carburetor). I was wondering if there was a chemical that would dissolve the brass while not reacting ...
1
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1answer
59 views

What is the alloying composition of the Zinc-Platinum System?

My research team and I are working on a bimetallic alloy consisting of Zinc and Platinum. We have looked for papers regarding the composition of Zinc-Platinum alloy. But there aren't many papers out ...
5
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1answer
161 views

Boiling sodium hydroxide in stainless steel cup: Solution turning to a blue color

I boiled highly concentrated sodium hydroxide in a stainless steel cup. This created a blackish layer on the bottom of the cup and turned the colour of the sodium hydroxide solution to blueish. Am I ...
2
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1answer
171 views

Thermal properties of 301 stainless steel

So I know that 301 stainless steel was chosen for the SpaceX Starship rocket as it can handle high temperature differences. What about this alloy makes the steel harden when it gets colder?
3
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1answer
40 views

Performing XPS on Pt–Ru/C nanoparticles

From what I understand, to get clear peaks, $\ce{Pt}$ is analyzed at $\ce{Pt}$ 4f; and $\ce{Ru}$ at $\ce{Pt}$ 3d. However, if i'm not mistaken, charge correction is needed. But $\ce{Ru}$ 3d(280/284 eV)...
1
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1answer
49 views

Properties of inconel [closed]

I am doing a project on the physics of the spaceX raptor engine. I believe it is made out of a certain type of inconel alloy. I want to understand why this alloy has the properties that it does, but I ...
1
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1answer
33 views

Amalgamation involving an alloy [closed]

Just curious, would mercury form an amalgam with gold that is already part of an alloy, i.e a gold platinum alloy?
6
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1answer
142 views

Origin of the 15% difference limit between solute and solvent atom radii in the Hume-Rothery rules

According to the Hume-Rothery rules for the substitutional solid solutions the atomic sizes of the the solute and solvent must not differ by more than 15%. Why should it be so?
0
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1answer
457 views

What is this white layer on brass?

I have an object made of what I assume to be brass, i.e. an alloy of copper and zinc. The curved parts have both a black layer and a white layer (also note the verdigris (I guess) on the left top, but ...
0
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0answers
149 views

Are Alloy Compositions Given in Weight Percent or Atom Percent

Often times I see alloys described like this, Lockalloy is an alloy that consists of 62% beryllium and 38% aluminum Are the precentages mentioned here in weight percent or atom percent? Is there a ...
1
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2answers
46 views

Thermal properties of aluminium alloy 6063 [closed]

I am looking for the operating temperature range both in a cold and hot environments (minimum and maximum operating temperatures) for aluminium alloy 6063. I'm new to finding this kind of information ...
0
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1answer
73 views

Should equiatomic iron–cobalt alloy be written as FeCo or CoFe?

I have an alloy made of 50% iron and 50% cobalt. I see occasionally in the literature this is written as FeCo alloy. But shouldn't it be CoFe alloy since the chemical symbols are supposed to be ...
7
votes
1answer
337 views

Do we have some "rule of thumb" to estimate the miscibility of metals?

For example, for ordinary fluids, we have polar and apolar ones. The "rule of thumb" is that polar fluids mix with each other, and also apolar fluids mix with each other, but polar fluids ...
0
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0answers
23 views

Can metal matrix composites be alloyed after their creation?

I've done a little research on metal matrix composites (MMCs), purely for fun and out of interest. Different types of metal powders are combined with reinforcement materials, to produce a reinforced ...
-1
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5answers
122 views

What are practical examples of simultaneous measuring of quantities?

I am a maths teacher and I'm looking for practical examples of measuring quantities simultaneously, so that mathematically one needs to construct and solve a system of equations. I thought that in the ...
0
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0answers
89 views

Difference between calcination, roasting and pyrolysis

Hie everyone. I have been going through pyrometallurgical processes for recycling lithium-ion batteries and l have been coming across these terms; calcination, pyrolysis and roasting which l need ...
28
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3answers
11k views

Why isn't the American nickel magnetic?

I never thought that modern American nickels actually contained nickel anymore. However, according to this wiki article, the coins actually do contain 25% nickel, the rest being copper. And yet, no US ...
0
votes
1answer
330 views

Electrical and Thermal conductivity of electrum alloys

I have tried to search for this to little effect - I am trying to find electrical and thermal conductivity values for Electrum (a gold and silver alloy). Most sites mention the values depend on the ...
1
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0answers
39 views

Tungsten-Rhenium alloy connections to Copper. Methods?

I want to use some fine WRe wire (50 micron diameter, 80/20) in a particular environment where it has to conduct a few millamps of current while supporting 100g of mass. The problem being the contact ...
0
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0answers
26 views

Separation of Al-Si alloys without electrolysis

Can pure (or roughly pure) $\ce{Al}$ be somehow thermally, chemically, or physically separated from the $\ce{Si}$ contained in an $\ce{Al-Si}$ alloy? How? Approximately what purity of Aluminum can be ...
1
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1answer
93 views

What materials are resistant to hot chlorine?

I'm looking to do an experiment involving hot chlorine gas (900 Celsius), however at the moment the only material I'm aware of that could cope with this is Hastelloy's C-22 alloy. What other ...
0
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0answers
33 views

Phase Diagram-Fe-C, and TTT: Hardness Scale

So far I know that the Hardess scale of these materials is this: Martensite> Bainite> Perlite > Cementite> Ferrite Where is Austenite along this scale? I know that Cementite is harder than Austenite....
10
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0answers
539 views

Why doesn't tantalum and tungsten form amalgam?

User @Poutnik has recently answered a question in which he quoted this statement from Wikipedia: Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, ...
3
votes
1answer
307 views

What would happen if I combined this polymer and this metal (assuming I can) [closed]

So let me explain, I recently found out about a material called sorbothane (which is a polymer). Now, sorbothane is special because not only does it highly efficiently absorb shock, but also highly ...
0
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0answers
1k views

Eutectic Phase Diagram of Al-Si Analysis

Hello, How can I know from this phase diagram: 1. The composition of the alloy Al-Si that allows precipitation to occure? 2. The range of temperatures where the Al-Si is soluble? 3. The range of ...
4
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0answers
41 views

Nanoparticle Alloys (Gold-Silver) not forming

I have synthesised what I thought were gold-silver alloys at various different compositions. The UV/vis data showed that nanoparticles alloys with a majority of the composition made from gold had one ...
1
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1answer
94 views

Substitute molten salt bath with temperature range from 400–500 °C

I'm looking for a suitable substitute for a $\ce{NaNO2/KNO3}$ salt bath (for quite obvious reasons due to the other applications of the latter chemical). The salt mixture needs to have around 400 to ...
3
votes
1answer
2k views

Is the flint used in disposable lighters toxic?

Especially the sparks that result when using them. I heard this from a friend and can't seem to find an answer on Google.
1
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2answers
319 views

How is it that earth's inner core is still solid?

Earth's inner core is made up of an alloy of Iron and Nickel. The important note here is that it is solid. The temperature at the inner core is about $5,763K = 5,490\text{ degrees C}$. Now the ...
1
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0answers
745 views

Find alloy composition by density

I have a square piece of metal from a processor heat sink that looks a lot like copper. I'm trying to find the alloy composition but I'm not sure how. I happen to have both a digital caliper and a ...
4
votes
1answer
601 views

Which karat gold is harder, 24 kt or 18 kt?

$\pu{24 kt}$ gold indicates that $24/24$ part of it, i.e. $100\%$ of it is gold. $\pu{18 kt}$ indicates that $18/24$ part of it is gold. As gold is a soft element, I reckoned that $\pu{18 kt}$ gold ...
6
votes
0answers
269 views

What are metal zip tags and belt buckles made of?

Metal zipper tags and belt buckles melt very easily and can be melted by heating it in the stove for 5 minutes. But other metals like aluminium refuse to melt even after hours. If you leave it ...
2
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2answers
555 views

Boric Acid and Brass Alloy

Can someone explain why boric acid prevents zinc from vapourizing out of the brass alloy when it is being melted? What is the actual chemistry occurring and why? Thanks
1
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1answer
225 views

How does bismuth's lone pair affect its properties as a metal and alloy?

Bismuth is really the only metal to exhibit a lone pair in its outermost shell, this means that it and its salts should be a Lewis base. As bismuth can act as a Lewis base, how does this affect its ...
-1
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1answer
73 views

How would ceramic coating inside the reactor affect heat transfer? [closed]

With the ceramic coating, would I be able to get its internal temperature raise upto 520. I would like to get a reactor fabricated for plastic pyrolysis. The temperature would maintained around 520C. ...
1
vote
1answer
56 views

What is the reason behind the 2% increase in silver metal composition just after melting the raw silver alloy (55% silver)? [closed]

I determined the silver composition from an alloy obtained from a jeweler to be 55% and wanted to extract silver out of it. However, upon melting around 5 kgs of alloy, the silver composition went up ...
10
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2answers
2k views

Brass Instrument: Dezincification or just scrubbed off?

I do own a brass instrument (a trombone). The lacquer is damaged. I asked how to deal with it here. Now I learned that the brass contains zinc, and there is a corrosion process called "...
3
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1answer
48 views

Which is the suitable process for ball milling?

Why do we mainly choose the wet ball milling process in spite of dry ball milling process? Both processes are used to make a homogeneous mixture of different compounds.
2
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0answers
52 views

Structural entity for the tattoo resembling spine surgery involving 6AL-4V ELI alloy

I have very little background in chemistry, so forgive me if I sound ridiculous and uneducated. I want to have a tattoo designed in honor if my spine surgery that I had. I think that molecular ...
4
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1answer
81 views

Why did my milled powders catch fire?

I milled a small amount of the sample ($75\%$ Al, $15\%$ Cu, $10\%$ Ni) mixed with toluene for 5 hours after which I set it on butter paper to dry. Then after 13 minutes I switched on the fan in the ...
1
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1answer
67 views

Iron-platinum refining

If I have an iron-platinum alloy, can I put this into a solution of $\ce{HCl}$ to dissolve the iron, leaving a $\ce{Pt}$ precipitate? I know that Fe dissolves in $\ce{HCl}$ to form $\ce{FeCl2}$ and $\...
5
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2answers
10k views

Does cold bluing steel prevent rust?

I've recently purchased a Damascus knife and am patiently awaiting it's arrival in the mail. I have been researching the potential care and maintenance habits for this craftsman blade, hoping to keep ...
16
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2answers
3k views

What does "René" mean in René alloys?

René alloys are nickel-based super alloys (René 41, René 88, René N5 etc. etc.). But how did it get the name René? Is it an acronym or contraction of other terms? It was created by Earl Ross and the ...
0
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2answers
3k views

How do foundries prevent zinc from boiling away when alloyed with Aluminum?

How do foundries prevent lower boiling point metals such as zinc from boiling away when alloyed in a furnace with higher boiling point metals such as aluminum?
5
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1answer
120 views

Why don't alloys self-galvanically corrode?

Total chemistry newbie here (so this may be a fairly obvious question). With that said, I've had a niggling question that I can't quite resolve myself; Given that galvanic corrosion is driven by the ...
-1
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1answer
100 views

Are there non-brittle silicon-based alloys? [closed]

Requirements: Silicon part is greater than 50% Has plasticity comparable to iron.