Questions tagged [alloy]
For questions about alloys.
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Properties of inconel
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 ...
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1answer
22 views
Amalgamation involving an alloy
Just curious, would mercury form an amalgam with gold that is already part of an alloy, i.e a gold platinum alloy?
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1answer
77 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?
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57 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 ...
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24 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 ...
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2answers
37 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
57 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 ...
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1answer
297 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 ...
asked Aug 11 '20 at 10:43
peterh - Reinstate Monica
8583 gold badges11 silver badges20 bronze badges
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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 ...
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5answers
114 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 ...
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0answers
53 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 ...
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19 views
Is the alloy of Fe, Si substitution alloy or interstitial alloy?
When atoms of the solute in a solid solution occupy positions
normally occupied by a solvent atom, we have a substitutional alloy. When the sol-
ute atoms occupy interstitial positions in the “holes” ...
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3answers
9k 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 ...
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1answer
191 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 ...
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0answers
27 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 ...
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23 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 ...
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1answer
74 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 ...
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26 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....
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282 views
Why does tantalum and tungsten not form amalgam?
User @Poutnik has recently answered a question in which he/she quoted this statement from Wikipedia:
Almost all metals can form amalgams with mercury, the notable
exceptions being iron, platinum, ...
3
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1answer
281 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 ...
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812 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
39 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 ...
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1answer
69 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 ...
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1answer
1k 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.
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2answers
154 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 ...
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0answers
595 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 ...
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1answer
432 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 ...
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0answers
255 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 ...
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2answers
475 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
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1answer
147 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 ...
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1answer
59 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. ...
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1answer
55 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 ...
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2answers
1k 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
45 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.
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50 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
75 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 ...
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1answer
63 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 $\...
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2answers
8k 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 ...
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2answers
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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 ...
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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?
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1answer
113 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 ...
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1answer
95 views
Are there non-brittle silicon-based alloys? [closed]
Requirements:
Silicon part is greater than 50%
Has plasticity comparable to iron.
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1answer
234 views
Why are there two vertical axes in the iron-carbon diagram? [closed]
More precisely, why do we have two axes that represent the same parameter, which is temperature?
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167 views
Very fast brass oxidation
I work for a company that manufactures pyrotechnics for the oil and gas industry, and we have been having an odd phenomenon occur.
One part, a brass tube with a copper clip filled with black powder, ...
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1answer
401 views
How can I find the eutectic point of gallium and aluminum?
I've been interested in liquid metals for a while, but I've stayed away from mercury for obvious health reasons. I have a sample of gallium and I've seen a liquid metal mixture of gallium and aluminum....
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0answers
2k views
Density of Interstitial compounds
I have read in my textbook (not very reliable) that density of interstitial compounds is lesser than parent compound. But how can this be true?
We add atoms to the lattice voids, so density should ...
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1answer
40 views
Cell walls in lath martensite - Meaning
What does cell walls mean in the context of lath martensite? Are they grain boundaries?
Quote (page 66 Structure and properties of engineering alloys - Smith): In the lath martensite of low-carbon ...
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1answer
848 views
Can a small amount of scandium be added to gold, platinum or palladium to create a wedding ring?
The number 21 has a special meaning to us, so we would like to make wedding rings with some scandium in it (element 21). I know scandium can be alloyed with aluminium or titanium, but can it also be ...
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1answer
618 views
Measuring lead content in pewter
I've bought pewter at the thrift store and I want to try casting metal. This pewter may contain toxic metals. A ready-made testing kit I've found cost €25 for each sample.
In comparison pewter of ...
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1answer
252 views
Reasons for existence of eutectic point for alloy systems
Why does a eutectic point exist for a system of alloy ? Why is it that there is such a definite ratio of composition at which this occurs ?
