Investigation on the fracture Behavior of shape memory alloy NiTi

被引：57

作者：

Chen, JH ^{[1
]}

Sun, W ^{[1
]}

Wang, GZ ^{[1
]}

机构：

[1] Lanzhou Univ Technol, Key State Lab New Mat Nonferrous Alloys, Lanzhou 730050, Gansu, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2005年 / 36A卷 / 04期

关键词：

D O I：

10.1007/s11661-005-0288-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work investigates the fracture behavior of shape memory alloy NiTi (50.7 at. pct Ni) at room temperature. Macroscopic mechanical tests, microscopic in situ observations of tensile fracture processes by scanning, electron microscopy (SEM), and detailed analyses of fracture Surfaces were carried out. The results reveal that specimens with different thicknesses show various shape memory effects and superelasticities. The main crack with a quasi-cleavage mode that combines cleavage with ductile tearing is initiated at the notch tip and is stress-control-propagated in line with the direction of the C maximum normal stress. The microstructure has little effect on the direction of crack propagation, but coarser Substructures show lower resistance to the crack propagation. In specimens with various types of notches, various notch acuities present different effects on the crack initiation and propagation and result in different fracture behaviors.

引用

页码：941 / 955

页数：15

共 13 条

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