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| TRANSFORMATION HYSTERESIS AND STABILITYOF STRAIN MARTENSITE IN Ni_(47)Ti_(44)Nb_9 ALLOY |
| ZHANG Chunsheng;CAI Wei;ZHAO Liancheng (Harbin Institute of Technology |
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Cite this article:
ZHANG Chunsheng;CAI Wei;ZHAO Liancheng (Harbin Institute of Technology. TRANSFORMATION HYSTERESIS AND STABILITYOF STRAIN MARTENSITE IN Ni_(47)Ti_(44)Nb_9 ALLOY. Acta Metall Sin, 1991, 27(3): 51-55.
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Abstract The transformation hysteresis and stability of strain martensite inNi_(47)Ti_(44)Nb_9 alloy have been studied by means of tensile test under various temper-atures, electrical resistance measurement and TEM observation. It was shown thatthere is a characteristic deformation temperature and a strain range, in which thecritical yield stress for stress-induced transformation acquires optimum matchingwith the yield strength of the β-Nb particles. In this case, deformation effectivelyincreases the transformation hysteresis, while the strain recovery ratio remains use-fully high. The martensite with irregular fine twin substructure and martensitecontaining some dislocations as well as martensite intersected by the β-Nb particlespossess high stability.
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Received: 18 March 1991
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