The effects of prestrain and annealing temperature on phase transformation
temperatures in Fel4Mn5Si8Cr4Ni shape memory alloy have been studied. The r
esults showed that when the annealing temperature was 673 K, both the A(f)
and the M-s temperatures increased appreciably as the prestrain increased,
the A, temperature increased slightly with increasing prestrain; the resist
ivity difference at 303 K between the heating and cooling curve also increa
sed with increasing prestrain, which agreed with the recovery strain. The s
hape memory effect in Fe-Mn-Si-Cr-Ni shape memory alloy is caused by the st
ress-induced gamma --> epsilon martensite transformation and its reverse tr
ansformation. When the prestrain was 10%, the M-s temperature decreased rem
arkably as the annealing temperature increased.