TY - JOUR
T1 - New aspects of martensite stabilization in Ni-Mn-Ga high-temperature shape memory alloy
AU - Khovaylo, V.
AU - Kainuma, R.
AU - Ishida, K.
AU - Omori, T.
AU - Miki, H.
AU - Takagi, T.
AU - Datesman, A.
N1 - Funding Information:
This work was partially supported by Grant-in-Aids for Scientific Research from the Ministry of Education, Science and Culture, Japan, and by the Russian Found for Basic Research (project Nos. 06-02-16266, 06-02-39030 and 07-02-13629).
PY - 2008/2
Y1 - 2008/2
N2 - We report on new aspects of martensite stabilization in high-temperature shape memory alloys. We show that, due to the difference in activation energies among various structural defects, an incomplete stabilization of martensite can be realized. In material aged at high temperatures, this gives rise to a variety of unusual features which are found to occur in the martensitic transformation. Specifically, it is shown that both forward and reverse martensitic transformations in a Ni-Mn-Ga high-temperature shape memory alloy can occur in two steps. The observed abnormal behaviour is evidence that, in certain circumstances, thermoelastic martensitic transformation can be induced by diffusion.
AB - We report on new aspects of martensite stabilization in high-temperature shape memory alloys. We show that, due to the difference in activation energies among various structural defects, an incomplete stabilization of martensite can be realized. In material aged at high temperatures, this gives rise to a variety of unusual features which are found to occur in the martensitic transformation. Specifically, it is shown that both forward and reverse martensitic transformations in a Ni-Mn-Ga high-temperature shape memory alloy can occur in two steps. The observed abnormal behaviour is evidence that, in certain circumstances, thermoelastic martensitic transformation can be induced by diffusion.
KW - Ageing
KW - Heusler alloys
KW - Martensite stabilization
KW - Martensitic transformation
KW - Shape memory alloys
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U2 - 10.1080/14786430801986670
DO - 10.1080/14786430801986670
M3 - Article
AN - SCOPUS:46049089605
SN - 1478-6435
VL - 88
SP - 865
EP - 882
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 6
ER -