期刊
SCRIPTA MATERIALIA
卷 113, 期 -, 页码 171-175出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.10.036
关键词
Shape memory alloys; Martensitic phase transformation; Microstructure; Toughness; Intrinsic and extrinsic toughening mechanisms
类别
资金
- Hong Kong Research Grant Council (RGC) through the GRF grant [16214215]
- 973 Program of China [2014 CB046902]
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.
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