Recent content by mah65

Thank you. If published in Nature or Science, it implies to be an important issue. Could give me the exact information or link of this paper?

Hi, I have a question regarding polymers. You know that polymers, basically, consist of chains of polymers, each chain including number of repeating units (monomer). These chains can be in amorphous or crystalline states. Experimentally, is it possible to fabricate and see a single chain...

The second phase in totally crystalline. We know the approximate position of the peaks (= the related 2teta) in XRD spectrum. We detected no such peaks in those positions, however. What can we do?

The answer to question C can be found here: http://en.wikipedia.org/wiki/Precipitation_hardening

I have performed heat treatment (aging) on my alloy. In this process fine precipitates form in the matrix of the alloy, which strengthen the alloy. However, XRD spectrum could not show the peaks related to the fine precipitates. 1- Why the peaks are not detectable? Is it because of the...

My Alloy was NiTiHf. Ti Hf are really prone to oxidation. So the oxide must be TiO2, or HfO2 or a combination of these :)

It is well known that Zirconia can be stabilized using Y2O3 or Sc2O3. However, stabilization is very dependent on the method of stabilizing; for example, coperecipitation, Sol-Gel, Solid State methods can provide different degrees of stabilization. Does anyone know what the reasons for these...

I have a related question ... When precipitation hardening is in progress, there is a peak in hardening; that is, at first the hardness increases, but after a time, the hardness starts to decrease. Why there is a peak in hardening? I don't think that the precipitates lose their coherency...

your question is not clear enough: "can be considered nanomaterial based on other characteristics?", however, I help u as much as I konw. Based on definition, nanoparticles are those "which are 1-100 nm in size, and demonstrate properties that other ordinary particles do not show". For...

What you are looking for is too specific. Maybe you can find them in Papers. about the phase diagrams, you can find them here : http://www1.asminternational.org/asmenterprise/apd/good luck

HI I want to heat treat my samples (dimensions: 4:4:2 mm3) at about 600 C, for different times from 30 min to 3 days. Since my alloy is highly sensitive to high temperature oxidation, I have to encapsulate them so as to prevent them from being oxidized. I was thinking of encapsulating...

What do you mean? did this simple solution worked? Only HCl with 100 Celsius degree temperature?! What do you mean by glass?! OK, please tell me about the condition, i.e. the container and any safety measurements I have to consider if I wanted to do carry it out.

unfortunately, I have to say that I could not remove that damn layer of oxide! If you could, please let me know. The yellow coating is so anti corrosive! and shows no reaction with those acids! However, the black one can easily be removed using NHO3 + HF + H2O.

one possible reason for this problem may be the design of the mold, in which the melt is cast. That is, these cracks may happen during the casting & solidification due to inappropriate and non-proportional heat loss, and not during the homogenization. Thus, the design of my new mold for casting...

Hi guys I have produced an ingot of NiTiHf alloy through Vacuum Induction Melting (VIM) process and by using pure materials of Ni, Ti and Hf. Casting was done in a Y2O3-coated steel mold, and the crucible was made of graphite. The problem is that, when I homogenize the ingot at 1000 oC and...