Effect of Aging on the Microstructure and Shape Memory Effect of a Hot-Rolled NiTiHf Alloy

被引：26
作者：
Javadi, Mahdi Moshref [1 ]
Belbasi, Majid [1 ]
Salehi, Mohammad T. [1 ]
Afshar, M. Reza [2 ]
机构：
[1] Iran Univ Sci & Technol, Sch Met & Mat Engn, Tehran, Iran
[2] Islamic Azad Univ, Dept Mat Engn, Sci & Res Branch, Tehran 1477893855, Iran
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2011年 / 20卷 / 4-5期
关键词：
high-temperature shape memory alloy; hot rolling; microstructure; Ni-Ti-Hf; shape memory effect; TRANSFORMATION; PHASE; HF; MARTENSITE; BEHAVIOR;
D O I：
10.1007/s11665-011-9885-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this article, the effect of aging on the microstructure and shape memory effect (SME) of a hot-rolled Ni(49)Ti(36)Hf(15) alloy is studied. The alloy was prepared by vacuum induction melting (VIM) and homogenized at 1000 A degrees C for 2 h. The homogenized alloy was then undergone 45% hot rolling at 850 A degrees C and aging at temperatures of 500 and 600 A degrees C for 2 h. Optical microscopy (OM) and scanning electron microscopy (SEM) conducted on the hot-rolled samples revealed that hot rolling improves microstructure, deformation, and recoverable strains such that the alloy recovers 3.10 of 3.23 and 5.61 of 6.25 strain in the homogenized and hot-rolled state, respectively. Aging, however, adversely affects the formability and SME of the alloy, which stems from the embrittling effect of the newly formed precipitates during the aging process.
引用
收藏
页码：618 / 622
页数：5
相关论文
共 16 条
[1]   Ni-Ti-Hf shape memory alloy: effect of aging and thermal cycling [J].
Besseghini, S ;
Villa, E ;
Tuissi, A .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 273 :390-394
[2]   Recent development of TiNi-based shape memory alloys [J].
Cai, W. ;
Meng, X. L. ;
Zhao, L. C. .
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE, 2005, 9 (06) :296-302
[3]   High-temperature shape memory alloys some recent developments [J].
Firstov, GS ;
Van Humbeeck, J ;
Koval, Y .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 378 (1-2) :2-10
[4]   THE STUDIES OF THE MARTENSITE TRANSFORMATIONS IN A TI36.5NI48.5HF15 ALLOY [J].
HAN, SD ;
ZOU, WH ;
JIN, S ;
ZHANG, Z ;
YANG, DH .
SCRIPTA METALLURGICA ET MATERIALIA, 1995, 32 (09) :1441-1446
[5]   A new precipitate phase in a TiNiHf high temperature shape memory alloy [J].
Han, XD ;
Wang, R ;
Zhang, Z ;
Yang, DZ .
ACTA MATERIALIA, 1998, 46 (01) :273-281
[6]   Shape-memory behaviors in an aged Ni-rich TiNiHf high temperature shape-memory alloy [J].
Meng, X. L. ;
Cai, W. ;
Fu, Y. D. ;
Li, Q. F. ;
Zhang, J. X. ;
Zhao, L. C. .
INTERMETALLICS, 2008, 16 (05) :698-705
[7]   Shape memory properties of the Ti36Ni49Hf15 high temperature shape memory alloy [J].
Meng, XL ;
Zheng, YF ;
Wang, Z ;
Zhao, LC .
MATERIALS LETTERS, 2000, 45 (02) :128-132
[8]   Microstructure of stress-induced martensite in a Ti-Ni-Hf high temperature shape memory alloy [J].
Meng, XL ;
Cai, W ;
Wang, LM ;
Zheng, YF ;
Zhao, LC ;
Zhou, LM .
SCRIPTA MATERIALIA, 2001, 45 (10) :1177-1182
[9]   Effect of aging on the phase transformation and mechanical behavior of Ti36Ni49Hf15 high temperature shape memory alloy [J].
Meng, XL ;
Zheng, YF ;
Wang, Z ;
Zhao, LC .
SCRIPTA MATERIALIA, 2000, 42 (04) :341-348
[10]   Physical metallurgy of Ti-Ni-based shape memory alloys [J].
Otsuka, K ;
Ren, X .
PROGRESS IN MATERIALS SCIENCE, 2005, 50 (05) :511-678
12