Grain size dependence of fracture toughness and crack-growth resistance of superelastic NiTi

被引：71

作者：

Ahadi, Asian ^{[1
,2
]}

Sun, Qingping ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China

[2] Wuhan Univ, Sch Civil Engn, State Key Lab Water Resources & Hydropower Engn, Wuhan, Hubei, Peoples R China

来源：

SCRIPTA MATERIALIA | 2016年 / 113卷

关键词：

Shape memory alloys; Martensitic phase transformation; Microstructure; Toughness; Intrinsic and extrinsic toughening mechanisms; SHAPE-MEMORY ALLOY; PHASE-TRANSITION; BEHAVIOR; TRANSFORMATION; DEFORMATION; STRENGTH; STRAIN;

D O I：

10.1016/j.scriptamat.2015.10.036

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The grain size (GS) dependence of fracture toughness (K-IC) and static crack-growth resistance (K-R) of superelastic NiTi with average GS from 10 to 1500 nm are investigated. The measurements of strain and temperature fields at the crack-tip region are synchronized with the force-displacement curves under mode-I crack opening tests. It is found that with GS reduction down to nanoscale, the K-IC and the size of crack-tip phase transformation zone monotonically decrease and the K-R changes from a rising to a flat R-curve. The roles of intrinsic and extrinsic toughening mechanisms in the GS dependence of the fracture process are discussed. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：171 / 175

页数：5

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