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虎门体育官方登录入口网:标题

Effect of directional solidification and porosity upon the superelasticity of Cu-Al-Ni shape-memory alloys

虎门体育官方登录入口网:作者

作者:Yuan, B (Yuan, Bin)^[1,2,3 ]; Zheng, PQ (Zheng, Peiqi)^[2 ]; Gao, Y (Gao, Yan)^[1,3 ]; Zhu, M (Zhu, Min)^[1,3 ]; Dunand, DC (Dunand, David C.)^[2 ]

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虎门体育官方登录入口网:摘要

Strain incompatibilities between grains in polycrystalline Cu-Al-Ni shape-memory alloys undergoing stress-induced reversible transformation reduce their ductility and their recoverable superelastic strains on unloading. These strain incompatibilities can be mitigated by creation of large, textured grains through directional solidification or large, bamboo grains intersecting the free surfaces of pores. To study these two approaches to improve superelasticity in Cu-Al-Ni alloys, polycrystalline Cu-13.5Al-4Ni (wt.%) samples were cast in porous and dense form, with and without directional solidification. When tested in compression, directionally-solidified, oligocrystalline bulk (non-porous) Cu-Al-Ni exhibits recoverable unloading strains as high as 6.6% at 210 degrees C, as compared to 3.1% for their conventionally-solidified counterparts. Similarly, when comparing conventionally-solidified Cu-Al-Ni SMA with 58% open porosity shows 1.4% recoverable unloading strain at 260 degrees C, whereas a value of 2.6% is achieved in directionally-solidified porous samples with bamboo grains straddling pores. This improvement in superelasticity remains present after 30 mechanical load-unload cycles at 260 degrees C. Thus, both directional solidification and addition of porosity can reduce strain incompatibilities between neighboring grains in polycrystalline Cu-Al-Ni alloys, allowing them to approach the intrinsic high superelasticity of single crystals. (C) 2015 Elsevier Ltd. All rights reserved.

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作者关键词:High-temperature shape-memory alloy; Cu-Al-Ni alloy; Superelasticity; Porous; Stress-induced transformation

虎门体育官方登录入口网:作者信息

作者信息

通讯作者地址:Yuan, B (通讯作者)

S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China.   增强组织信息的名称     South China University of Technology

地址:

	[ 1 ] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA   增强组织信息的名称     Northwestern University
	[ 3 ] Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510640, Guangdong, Peoples R China

电子邮件地址:apsheng@scut.edu.cn

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ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

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