Graded phase structure in the surface layer of NiTi alloy processed by surface severe plastic deformation

被引：30

作者：

Hu, T. ^{[2
,3
]}

Chen, L. ^{[3
]}

Wu, S. L. ^{[2
]}

Chu, C. L. ^{[1
]}

Wang, L. M. ^{[3
]}

Yeung, K. W. K. ^{[4
]}

Chu, Paul K. ^{[2
]}

机构：

[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China

[2] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China

[3] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA

[4] Univ Hong Kong, Dept Orthopaed & Traumatol, Hong Kong, Hong Kong, Peoples R China

来源：

SCRIPTA MATERIALIA | 2011年 / 64卷 / 11期

关键词：

Graded phase; Nanocrystalline; NiTi alloy; Deformation heating; Surface mechanical attrition treatment; MECHANICAL ATTRITION TREATMENT; STACKING-FAULT ENERGY; SHAPE-MEMORY ALLOY; MARTENSITIC-TRANSFORMATION; STRAIN-RATE; TINI ALLOY; BEHAVIOR; DUCTILITY; COPPER;

D O I：

10.1016/j.scriptamat.2011.02.008

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The graded phase structure and its evolution in the surface of NiTi alloy after surface mechanical attrition treatment are studied using transmission electron microscopy. The initial B2-B19' phase transformation occurs at low strain level. As the deformation strain increases, the B19' martensite phase transforms back to B2 phase giving rise to graded phases. Our study reveals that stress induced martensite transformation and deformation heating play important roles in the formation of this graded phase structure. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1011 / 1014

页数：4

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