What Determines the Formation of Metallic Glasses?

[darkelf]

Hello,

Having a spot of bother here trying to understand the glass formation in metallic glasses. Could anyone please explain or point me to a source that explains in details structure and kinetics in glass formation?

Thanks

 

[Astronuc]

Hello,

Having a spot of bother here trying to understand the glass formation in metallic glasses. Could anyone please explain or point me to a source that explains in details structure and kinetics in glass formation?

Thanks

Basically glasses are amorphous, while ceramics and metals have a regular crystalline (lattice) structure or regular 3D order of atoms that form plane with a 'regular' and repeated geometry.

The way to make an amorphous material is to cool (chill) it rapidly (rapid solidification) before the atoms can establish a crystalline (ordered) structure. One method is to allow the liquid alloy or melt to cool on a chill block (cylinder) which rotates beneath the melt stream. A ribbon of metglass or amorphous metal can be formed in this way.

Cooling rates are on the order of 100 K/s to 1000 K/s.

Here's some more information - Mystery Of Metallic Glass Is Cracked By Johns Hopkins Engineers
http://www.sciencedaily.com/releases/2006/01/060126190325.htm

https://jshare.johnshopkins.edu/thufnag1/Public_html/metallicglass.html

http://en.wikipedia.org/wiki/Amorphous_metal

See also - http://metglas.com/tech/index.htm

 

[oswaler]

for your question. Metallic glass formation is a fascinating area of research that has gained a lot of attention in recent years. Essentially, metallic glasses are alloys that have a disordered atomic structure, similar to that of glass, rather than a crystalline structure like most metals. This unique structure gives metallic glasses some unique properties, such as high strength and resilience, making them potentially useful for a wide range of applications.

The process of forming metallic glasses can be quite complex and is still not fully understood. However, it is generally believed that the key factor in glass formation is the cooling rate of the alloy. In order to form a glass, the alloy needs to be cooled rapidly enough to prevent the atoms from arranging themselves into a crystalline structure. This can be achieved through various methods, such as rapid quenching or using high-pressure techniques.

In terms of the structure and kinetics of glass formation, there are several theories and models that have been proposed. One popular theory is the "constrained liquid" model, which suggests that the disordered structure of metallic glasses is a result of the atoms being trapped in a liquid-like state due to the high cooling rate. Other theories involve the importance of local atomic arrangements and the role of thermodynamics in determining the final structure.

There are many resources available that go into more detail about the structure and kinetics of glass formation in metallic glasses. Some recommended sources include research articles from scientific journals, textbooks on materials science and metallurgy, and online resources from reputable institutions or organizations. I hope this helps guide you in your understanding of this fascinating topic. Best of luck in your research!