Bimodal nanocrystallization of NiTi shape memory alloy by laser shock peening and post-deformation annealing

被引：138

作者：

Ye, Chang ^{[1
]}

Suslov, Sergey ^{[2
]}

Fei, Xueling ^{[3
]}

Cheng, Gary J. ^{[1
]}

机构：

[1] Purdue Univ, Sch Ind Engn, W Lafayette, IN 47906 USA

[2] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47906 USA

[3] Michigan State Univ, Dept Chem Engn & Mat Sci, E Lansing, MI 48824 USA

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 19期

关键词：

Laser shock peening (LSP); Post deformation annealing; Shape memory alloys (SMAs); Amorphization; Nanocrystallization; SEVERE PLASTIC-DEFORMATION; HIGH-PRESSURE TORSION; NANOSTRUCTURED METAL; MECHANICAL RESPONSE; THERMAL-STABILITY; AMORPHIZATION; TRANSFORMATION; 304-STAINLESS-STEEL; TEMPERATURE; PERFORMANCE;

D O I：

10.1016/j.actamat.2011.07.070

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, surface nanocrystallization of NiTi intermetallic alloy by a novel method is reported. The NiTi alloy is processed by laser shock peening (LSP) and controlled annealing. The microstructure of the NiTi alloy after processing is characterized by transmission electron microscopy. At the top surface of the material, a nanostructure with bimodal grains is obtained. The mechanism of the formation of the bimodal microstructure is discussed. At the material subsurface, deformation twins are generated by LSP and retained after controlled annealing. Tensile test results showed that both strength and ductility are significantly improved through LSP and controlled annealing. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：7219 / 7227

页数：9

共 46 条

[1] An in situ transmission electron microscope study of the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening [J].