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

被引：69

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

共 32 条

[1] Stress-induced nanoscale phase transition in superelastic NiTi by in situ X-ray diffraction
Ahadi, Aslan
Sun, Qingping
[J]. ACTA MATERIALIA, 2015, 90 : 272 - 281
[2] Effects of grain size on the rate-dependent thermomechanical responses of nanostructured superelastic NiTi
Ahadi, Aslan
Sun, Qingping
[J]. ACTA MATERIALIA, 2014, 76 : 186 - 197
[3] Stress hysteresis and temperature dependence of phase transition stress in nanostructured NiTi-Effects of grain size
Ahadi, Aslan
Sun, Qingping
[J]. APPLIED PHYSICS LETTERS, 2013, 103 (02)
[4] [Anonymous], 1975, Fracture of brittle solids
[5] On the fracture toughness enhancement due to stress-induced phase transformation in shape memory alloys
Baxevanis, T.
Parrinello, A. F.
Lagoudas, D. C.
[J]. INTERNATIONAL JOURNAL OF PLASTICITY, 2013, 50 : 158 - 169
[6] Baxevanis T., 2008, INT J FRACTURE, V191, P191
[7] On the Fracture Toughness of Pseudoelastic Shape Memory Alloys
Baxevanis, Theocharis
Landis, Chad M.
Lagoudas, Dimitris C.
[J]. JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, 2014, 81 (04):
[8] A methodology for high resolution digital image correlation in high temperature experiments
Blaber, Justin
Adair, Benjamin S.
Antoniou, Antonia
[J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 2015, 86 (03)
[9] Self-Oscillating Regime of Crack Propagation Induced by a Local Phase Transition at Its Tip
Boulbitch, Alexei
Korzhenevskii, Alexander L.
[J]. PHYSICAL REVIEW LETTERS, 2011, 107 (08)
[10] Experimental investigation of crack initiation in thin sheets of nitinol
Daly, S.
Miller, A.
Ravichandran, G.
Bhattacharya, K.
[J]. ACTA MATERIALIA, 2007, 55 (18) : 6322 - 6330

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