THE TENSILE BEHAVIOR OF A COLD-ROLLED AND REVERSE-TRANSFORMED EQUIATOMIC TINI ALLOY

被引:106
作者
LIN, HC [1 ]
WU, SK [1 ]
机构
[1] NATL TAIWAN UNIV, INST MAT SCI & ENGN, TAIPEI 106, TAIWAN
来源
ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 05期
关键词
D O I
10.1016/0956-7151(94)90371-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The tensile test shows that the martensite accommodation/reorientation process in the as-cold-rolled equiatomic TiNi alloy is depressed due to the hindrance of deformed martensite structures and defects. If the cold-rolled equiatomic TiNi alloy is subjected to a reverse martensitic transformation (RMT) at temperature < 300-degrees-C, the strengthening effect induced by cold-rolling can significantly improve the alloy's characteristic shape memory effect (SME) and pseudoelasticity (PE) by raising the critical shear stress for slip. The sigma(y)M can improve from 380 MPa of solution treated specimen to 1000 MPa of 31% cold-rolled RMT specimen. Meanwhile, for its PE characteristic, a cold-rolling RMT process can also increase significantly the stored mechanical energy and the energy storage efficiency. Experimental results show that, even in up to 20% thickness-reduced RMT TiNi alloy, the specimen still has 20% elongation at fracture. If the cold-rolled specimens am subjected to an annealing at temperature greater-than-or-equal-to 400-degrees-C, the martensite accommodation/reorientation process can recover gradually due to the nullification of deformed martensite structures and defects. Finally the recrystallization occurs at annealing temperature greater-than-or-equal-to 600-degrees-C.
引用
收藏
页码:1623 / 1630
页数:8
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