Microstructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism

被引:37
作者
Hu, T. [1 ]
Chu, C. L. [2 ]
Wu, S. L. [1 ,3 ]
Xu, R. Z. [1 ]
Sun, G. Y. [4 ]
Hung, T. F. [1 ]
Yeung, K. W. K. [5 ]
Wu, Z. W. [1 ]
Li, G. Y. [4 ]
Chu, Paul K. [1 ]
机构
[1] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China
[2] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China
[3] Hubei Univ, Sch Mat Sci & Engn, Wuhan 430062, Peoples R China
[4] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 110082, Hunan, Peoples R China
[5] Univ Hong Kong, Dept Orthopaed & Traumatol, Hong Kong, Hong Kong, Peoples R China
关键词
Nanostructured intermetallic; Plastic deformation mechanisms; Phase transformation; Grain boundaries; Transmission electron microscopy; SHAPE-MEMORY ALLOY; MARTENSITIC-TRANSFORMATION; PLASTIC-DEFORMATION; NANOCRYSTALLIZATION; AMORPHIZATION; TITANIUM; STRESS; STABILIZATION; REORIENTATION; REFINEMENT;
D O I
10.1016/j.intermet.2011.03.020
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Both nanocrystalline and amorphous phases are observed from the near surface of nickel titanium shape memory alloy (NiTi SMA) with the B2 austenite phase after surface mechanical attrition treatment (SMAT). The microstructure and phase changes are systematically studied by cross-sectional and plane-view transmission electron microscopy. The strain induces grain refinement and it is accompanied by increased strain in the surface layer triggering the onset of highly dense dislocations and dislocation tangles (DTs), formation of the martensite plate via stress-induced martensite (SIM) transformation (B2 to B19'), and dislocation lines (DLs) as well as dense dislocation walls (DDWs) inside the martensite plate leading to the subdivision of the martensite plate. In addition, reverse martensite transformation (B19' to B2) and amorphization take place concurrently in the surface region, and successive subdivision and amorphization finally result in the formation of well separated nanocrystalline and amorphous phases in the near surface. The average grain size of the nanocrystallites is about 20 nm. Owing to the almost complete reverse martensite transformation as well as thermal stability, the strain-induced nanocrystalline structure has the B2 austenite phase in the surface layer and no transformation occurs. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1136 / 1145
页数:10
相关论文
共 43 条
[1]   The high-strain-rate response of alpha-titanium: Experiments, deformation mechanisms and modeling [J].
Chichili, DR ;
Ramesh, KT ;
Hemker, KJ .
ACTA MATERIALIA, 1998, 46 (03) :1025-1043
[2]  
Cullity B.D., 1978, ELEMENTS XRAY DIFFRA, VSecond, P284
[3]   THE SURFACE PERFORMANCE OF SHOT PEENED AND ION-IMPLANTED NITI SHAPE-MEMORY ALLOY [J].
GRANT, DM ;
GREEN, SM ;
WOOD, JV .
ACTA METALLURGICA ET MATERIALIA, 1995, 43 (03) :1045-1051
[4]   New discoveries in deformed metals [J].
Hansen, N .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2001, 32 (12) :2917-2935
[5]   Surface mechanical attrition treatment induced phase transformation behavior in NiTi shape memory alloy [J].
Hu, T. ;
Wen, C. S. ;
Lu, J. ;
Wu, S. L. ;
Xin, Y. C. ;
Zhang, W. J. ;
Chu, C. L. ;
Chung, J. C. Y. ;
Yeung, K. W. K. ;
Kwok, D. T. K. ;
Chu, Paul K. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 482 (1-2) :298-301
[6]   Amorphization of TiNi induced by high-pressure torsion [J].
Huang, JY ;
Zhu, YT ;
Liao, XZ ;
Valiev, RZ .
PHILOSOPHICAL MAGAZINE LETTERS, 2004, 84 (03) :183-190
[7]   Graded nanostructures produced by sliding and exhibiting universal behavior [J].
Hughes, DA ;
Hansen, N .
PHYSICAL REVIEW LETTERS, 2001, 87 (13) :1-135503
[8]   Transformation behaviour and unusual twinning in a NiTi shape memory alloy ausformed using equal channel angular extrusion [J].
Karaman, I ;
Kulkarni, AV ;
Luo, ZP .
PHILOSOPHICAL MAGAZINE, 2005, 85 (16) :1729-1745
[9]   Deformation twins in pure titanium processed by equal channel angular pressing [J].
Kim, I ;
Kim, J ;
Shin, DH ;
Laio, XZ ;
Zhu, YT .
SCRIPTA MATERIALIA, 2003, 48 (06) :813-817
[10]   Nanocrystallization of a Ti-50.0Ni(at.%) alloy by cold working and stress/strain behavior [J].
Kim, Yeon-ho ;
Cho, Gyu-bong ;
Hur, Shin-goo ;
Jeong, Sang-sik ;
Nam, Tae-hyun .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 438 :531-535