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Texture Development in the Ni47Ti44Nb9 Shape Memory Alloy During Successive Thermomechanical Processing and Its Effect on Shape Memory and Mechanical Properties
Y. Yan; W. Jin; X. W. Li
2013
Source PublicationMetallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN1073-5623
Volume44AIssue:2Pages:978-989
AbstractFor improving the shape memory performance and mechanical properties of shape memory alloys (SMAs), crystallographic texture and second phase are generally induced in SMAs by suitable thermomechanical processing. For this purpose, the development of texture in the Ni47Ti44Nb9 SMA during successive processing (e.g., hot forging, hot rolling, cold rolling, and heat treatment) and the effects of texture, grain size, and beta-Nb particle precipitation on recoverable strains and tensile properties were studied. In the hot-forged and hot-rolled Ni47Ti44Nb9 alloy rods, intense aOE (c) 111 > fibers are formed, and water quenching from 873 K and 1123 K (600 A degrees C and 850 A degrees C) leads to the decrease in intensity of aOE (c) 111 > fiber in the hot-rolled rod. When the hot-forged rod is hot-rolled into sheet, intense {001} and weak {123} fibers appear, but grain growth leads to the disappearance of {001} fiber and {110}aOE (c) 001 > becomes the strongest component. Cold-rolling deformation of the hot-rolled sheet promotes the development of gamma-fiber and the convergence of {332} and {123} fibers to {233}aOE (c) 110 > and {123}aOE (c) 121 > components, respectively, and the intense component is turned into {111}aOE (c) 110 >; in this case, the recoverable strain (epsilon (SRS)) and tensile yield strength (sigma (YS) ) exhibit an anisotropy. When the quenching temperature is 1123 K (850 A degrees C), some weaker components appear, the anisotropy of epsilon (SRS) disappears, and the difference level in sigma (YS) along the rolling direction (RD) and transverse direction (TD) becomes smaller. Therefore, an appropriate heat-treatment temperature should be selected to maintain the deformation texture and also to obtain fine grains for different thermomechanical processing.
description.department[yan, y. ; li, x. w.] northeastern univ, inst mat phys & chem, coll sci, shenyang 110004, peoples r china. [jin, w.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [li, x. w.] northeastern univ, minist educ, key lab anisotropy & texture mat, shenyang 110004, peoples r china. ; yan, y (reprint author), northeastern univ, inst mat phys & chem, coll sci, shenyang 110004, peoples r china. ; yingyan@imp.neu.edu.cn ; xwli@mail.neu.edu.cn
KeywordStress-induced Transformation Low-carbon Steels Tini Alloy Phase-transformation Single-crystals Orientation Evolution Behavior Microstructure Polycrystals
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71620
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Y. Yan,W. Jin,X. W. Li. Texture Development in the Ni47Ti44Nb9 Shape Memory Alloy During Successive Thermomechanical Processing and Its Effect on Shape Memory and Mechanical Properties[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2013,44A(2):978-989.
APA Y. Yan,W. Jin,&X. W. Li.(2013).Texture Development in the Ni47Ti44Nb9 Shape Memory Alloy During Successive Thermomechanical Processing and Its Effect on Shape Memory and Mechanical Properties.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,44A(2),978-989.
MLA Y. Yan,et al."Texture Development in the Ni47Ti44Nb9 Shape Memory Alloy During Successive Thermomechanical Processing and Its Effect on Shape Memory and Mechanical Properties".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 44A.2(2013):978-989.
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