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Questions tagged [alloy]

For questions about alloys.

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Which alloy forms the thinnest sulfide surface passivation layer?

Metal sulfides seem to often form thick layers on alloy surfaces exposed to molten $\ce{S}$. Are there alloy surfaces capable of passivation with $\ce{S}$ before the layer thickness reaches $\pu{1 nm}$...
Paul Kolk's user avatar
  • 198
16 votes
3 answers
2k views

How can I identify the material of this mystery gear?

I have this small gear which has sat on my desk for a couple years. I can't remember where it originally came from or what material it's made out of, so I'm hoping you can help me solve this mystery. ...
hifkanotiks's user avatar
14 votes
3 answers
1k views

Is anything other than metals soluble in molten metals/alloys?

The question stems from my search on staining metals; in particular I commonly encountered "Can you dye a molten metal" questions, with the usual, simple answer of "any pigment will ...
SF.'s user avatar
  • 631
3 votes
3 answers
88 views

Eutectic temperatures of multicomponent metal carbides

Some carbides do not melt at atmospheric pressure. At high enough temperature, metallic element is in vapor phase. Experimentation with these systems is complicated because of their high melting or ...
Paul Kolk's user avatar
  • 198
1 vote
1 answer
65 views

Is 304 stainless steel an appropriate choice for making a tin/lead solder pot?

Are 304 stainless steel plates suitable for making a tin/lead melting pot operating at 300 °C or 572 °F? My concern is that the liquid alloy could form a kind of amalgam on the surface of the steel, ...
Daniel Bonadio's user avatar
0 votes
1 answer
70 views

Why Green Solution After Putting Bismuth Antimony in Nitrogen Acid

I am in a physics lab studying dislocation, and we submerged a bismuth antimony sample in nitrogen acid (about 50% concentration, if I remembered it right) as the first step to etch it. There were ...
Yuting Z's user avatar
0 votes
2 answers
261 views

Classification of mixtures for metals?

From my understanding, Alloys have metallic bonds between different metal elements. How does it make sense to classify alloys as a mixture then? Is there a similarity between an alloy and a mixture ...
Jeremy Clarkson's user avatar
4 votes
1 answer
211 views

Why does cold welding not work with carbon steels?

Cold welding is the process of joining metals using pristine surfaces without contaminents(oxide layers, oil, dust...) using pressure through atomic diffusion between the metal joints. Why does this ...
Andi Iacob's user avatar
3 votes
1 answer
204 views

Nichrome alloy corrosion at high temperature

We are currently using a nichrome (80/20) wire based heater to surround a sample chamber that we wish to heat by radiation. Maximum sample temperature is 400degC in an atmosphere of air that may be ...
Dirk Bruere's user avatar
  • 1,652
0 votes
0 answers
83 views

Separate aluminium from brass threaded bushing without affecting the brass

I wanted to separate aluminium from brass threaded bushing without affecting the brass. I also suppose that brass isn't the brass but it's a phosphor bronze. Does brass and phosphor bronze amalgamate ...
Malum Wolfram's user avatar
3 votes
1 answer
10k views

Understanding grades of steel for cookware. 18/10 vs 18/8

I am looking for a stainless steel cookware and while researching on the best kind of stainless steel cookware, I came across this comment on youtube: Actually 18/10 steel is better and costlier. You'...
4-K's user avatar
  • 267
2 votes
0 answers
143 views

How to safely alloy magnesium castings into aluminum?

I want to dissolve previously sand cast magnesium to molten aluminum to create an aluminum magnesium alloy. Of course I want to do this as safely, and inexpensively, as possible. I have an electric (...
Rudy's user avatar
  • 121
2 votes
1 answer
3k views

Comprehensive list of metal alloys along with Moh's hardness scale

Material property lists, such as springermaterials.com, has lists of metal alloys and their properties. Is there a similar website that lists alloys along with their Mohs scale hardness? For ...
Jack Miller's user avatar
2 votes
1 answer
246 views

How do I separate an Indium-Gallium alloy into Indium and Gallium?

I've recently learned more about Indium and Gallium, and I find them quite interesting, especially how an alloy can be manually made simply by rubbing them together. I'm curious though, is there a ...
JShoe's user avatar
  • 131
12 votes
3 answers
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) ...
Kurt Hikes's user avatar
  • 1,813
2 votes
0 answers
36 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 ...
Shaun Han's user avatar
  • 121
0 votes
1 answer
430 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 ...
user114725's user avatar
8 votes
2 answers
1k 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, ...
Dhruvin's user avatar
  • 99
0 votes
1 answer
861 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 ...
Jason's user avatar
  • 9
1 vote
1 answer
231 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 ...
isentropic compression's user avatar
6 votes
1 answer
934 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 ...
2930983905's user avatar
2 votes
1 answer
279 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?
und3niable's user avatar
3 votes
1 answer
64 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)...
quantum.tyrant's user avatar
1 vote
1 answer
59 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 ...
fredc1's user avatar
  • 25
1 vote
1 answer
42 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?
Ubun's user avatar
  • 23
6 votes
1 answer
497 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?
Dibster7978's user avatar
1 vote
1 answer
6k 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 ...
Skippy le Grand Gourou's user avatar
2 votes
1 answer
1k views

Are alloy compositions given in weight percent or atomic percent

Often I see alloys described like this, Lockalloy is an alloy that consists of 62% beryllium and 38% aluminum Are the percentages mentioned here a weight percent (wt.%) or atomic percent (at.%)? Is ...
Terry Price's user avatar
1 vote
2 answers
60 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 ...
user101030's user avatar
0 votes
1 answer
124 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 ...
Terry Price's user avatar
7 votes
1 answer
557 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 ...
peterh's user avatar
  • 916
1 vote
0 answers
35 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 ...
Mat NX's user avatar
  • 155
-1 votes
5 answers
255 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 ...
Geoff's user avatar
  • 109
0 votes
0 answers
248 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 ...
bryanmaks's user avatar
28 votes
3 answers
16k 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 ...
mpprogram6771's user avatar
0 votes
1 answer
1k 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 ...
asuprem's user avatar
  • 113
1 vote
0 answers
70 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 ...
Dirk Bruere's user avatar
  • 1,652
0 votes
0 answers
29 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 ...
R Dev's user avatar
  • 313
2 votes
1 answer
355 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 ...
0x777C's user avatar
  • 197
0 votes
0 answers
58 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....
noam Azulay's user avatar
17 votes
2 answers
1k 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, ...
Nilay Ghosh's user avatar
3 votes
1 answer
347 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 ...
Khy foster's user avatar
0 votes
0 answers
3k 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 ...
Noam Azulay's user avatar
4 votes
0 answers
48 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 ...
The Free Radical's user avatar
1 vote
1 answer
182 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 ...
Stuggi's user avatar
  • 131
5 votes
1 answer
5k 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.
Peter's user avatar
  • 51
2 votes
2 answers
482 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 5,763 K = 5,490 °C. Now the melting point of both ...
K Split X's user avatar
  • 153
1 vote
0 answers
1k 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 ...
Nicolas's user avatar
  • 141
10 votes
1 answer
351 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 ...
theenigma017's user avatar
4 votes
2 answers
819 views

Boric Acid and Brass Alloy

Why does boric acid prevent zinc from vapourizing out of the brass alloy when it is being melted? What is the actual chemistry involved?
Mary's user avatar
  • 147