Magnetic field induced martensite 4

[Greenleader]

I am not a metallurgist, so please be easy with the terms. I have a question; is magnetic field induced martensite, and strain induced martensite, different terms for the same process? Thanks, Gerald

 

[metengr]

Here is a web site to obtain several technical papers on this topic. Even as a metallurgist, I had to read the Abstracts twice to comprehend this information.

http://www.sendai.kopas.co.jp/METAL/PUBS/thesis_e/e_abst/41-08/index.html

 

[Carburize]

Whoa!! Heavy stuff but I think they answer your question.
It appears that they are not the same, the magnetic field induced transformation seems to be a reversible phenomenon in some shape memory alloys and only exists while the field is applied.Stain induced transformation is however not reversible and can occur in more conventional alloys.

 

[metengr]

As a side note to magnetic fields, I found this interesting technical presentation by our friends at Oak Ridge on the topic of "Ultrahigh Magnetic Field Processing of Materials for Developing Customized Microstructures and Enhanced Performance"

http://www.oit.doe.gov/imf/pdfs/revpres_10_ludtka.pdf

 

[Greenleader]

Much obliged, metenger!

I just discovered this topic, so I have a lot of reading to do. Thanks again, Jerry

 

[mcguire]

As meteng pointed out, there can be a transformation from austenite to martensite induced by applying a magnetic field which reverses with the removal of the field. The strain induced transformation requires significant plastic deformation and remains after the stress which imposed the strain is removed.

 

[arunmrao]

I learnt something new. Though this was vaguely in my memory that one transformation is reversible while the other is not. Great posting and equally good responses.

 

[metman]

Greenleader,

For more reading on the subject, the following link gives some practial applications of strain induced martensite:

forums/0001.htm

 

[unclesyd]

Not quite on topic but interesting. Take a look at the first set of papers.

http://www.gamf.hu/indexe.php?modul=research