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| EFFECT OF CONSTRAINT TRANSFORMATION ON RECOVERY STRAIN OF Ti44Ni47Nb9 ALLOY |
| LIU Xiaopeng; JIN Wei; CAO Mingzhou; YANG Rui |
| Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
LIU Xiaopeng; JIN Wei; CAO Mingzhou; YANG Rui. EFFECT OF CONSTRAINT TRANSFORMATION ON RECOVERY STRAIN OF Ti44Ni47Nb9 ALLOY. Acta Metall Sin, 2004, 40(4): 363-366 .
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Abstract The effect of constraint transformation heating temperature Th on the free reverse transformation behavior of 10\% strained
Ti44Ni47Nb9 alloy was investigated, and the
experimental results showed that after the first constraint transformation the strained Ti44Ni47Nb9 alloy exhibits two separate recovery strains εr1 and εr2 on subsequent free reverse transformation, which increases
and decreases with increasing Th, respectively. However, the total recovery strain εr(εr=εr1+εr2)of Ti44Ni47Nb9 alloy decreases with increasing Th. The plastic strain of Ti44Ni47Nb9 alloy is increased by the deformation of martensite under the recovery stress during the constraint
transformation, which decreases εr strain of
Ti44Ni47Nb9 alloy. Since the martensite
of strained Ti44Ni47Nb9 alloy
is consisted of M1 and M2 oriented martensites with different strain
levels after the first constraint transformation, strains εr1 and εr2
are related to M1 and M2 oriented martensite reverse transformations respectively.
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Received: 16 April 2003
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