Questions tagged [alloy]
For questions about alloys.
107
questions
2
votes
0
answers
87
views
Does zinc form any sulfosalts that are not reactive to chromium?
If extremely fine chromium powder is made in a ball mill under inert gas atmosphere, is it possible that adding a sulfosalt of zinc to this process yields a mix of these powders without reaction with ...
- 253
2
votes
0
answers
98
views
Can a diamond dissolve in molten iron?
The melting point of diamond is 4000C and the melting point of iron is 1538C. However, the question is if a diamond is soluble in an iron solvent. Diamond is made up of carbons. And I know steel is ...
- 21
6
votes
0
answers
229
views
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 $\pu{1 nm}$...
- 253
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.
...
- 319
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 ...
- 631
3
votes
3
answers
101
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 ...
- 253
2
votes
1
answer
85
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, ...
0
votes
1
answer
73
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 ...
- 11
0
votes
2
answers
291
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 ...
4
votes
1
answer
232
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 ...
- 51
3
votes
1
answer
255
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 ...
- 1,820
0
votes
0
answers
93
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 ...
3
votes
1
answer
14k
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'...
- 267
2
votes
0
answers
175
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 (...
- 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 ...
- 39
3
votes
1
answer
278
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 ...
- 141
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) ...
- 1,823
2
votes
0
answers
38
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 ...
- 121
0
votes
1
answer
519
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 ...
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, ...
- 99
0
votes
1
answer
991
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 ...
- 9
1
vote
1
answer
249
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 ...
6
votes
1
answer
1k
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 ...
- 63
2
votes
1
answer
289
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?
- 151
3
votes
1
answer
65
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
vote
1
answer
62
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 ...
- 25
1
vote
1
answer
44
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?
- 23
6
votes
1
answer
515
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?
- 77
1
vote
1
answer
7k
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 ...
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 ...
- 151
1
vote
2
answers
62
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 ...
- 21
0
votes
1
answer
131
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 ...
- 151
8
votes
1
answer
586
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 ...
- 926
1
vote
0
answers
38
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 ...
- 155
-1
votes
5
answers
260
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 ...
- 109
0
votes
0
answers
267
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
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 ...
- 1,296
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 ...
- 113
1
vote
0
answers
77
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 ...
- 1,820
0
votes
0
answers
31
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 ...
- 323
3
votes
1
answer
377
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 ...
- 207
0
votes
0
answers
59
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....
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, ...
- 26.5k
3
votes
1
answer
352
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 ...
- 39
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 ...
4
votes
0
answers
49
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
vote
1
answer
197
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 ...
- 131
5
votes
1
answer
6k
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.
- 51
2
votes
2
answers
498
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 ...
- 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 ...
- 141