时效温度对Fe42.5Ni28Co17Al11.5Ta1形状记忆合金组织及伪弹性的影响

doi:10.13251/j.issn.0254-6051.2020.04.024

金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 120-123.DOI: 10.13251/j.issn.0254-6051.2020.04.024

时效温度对Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁形状记忆合金组织及伪弹性的影响

陈朝霞^1,2, 彭文屹¹

1. 南昌大学材料科学与工程学院, 江西南昌 330013;
2. 华东交通大学材料科学与工程学院, 江西南昌 330013

收稿日期:2019-09-20 出版日期:2020-04-25 发布日期:2020-05-08
通讯作者: 彭文屹,教授,E-mail: wypengtougao@163.com
作者简介:陈朝霞(1979—),女,讲师,博士研究生,主要从事金属功能材料方面的研究,E-mail:czx79@126.com
基金资助:
国家自然科学基金(51461030);江西省教育厅科学技术研究项目(GJJ160481)

Effect of aging temperature on microstructure and pseudoelasticity of Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁ shape memory alloy

Chen Zhaoxia^1,2, Peng Wenyi¹

1. School of Materials Science and Engineering, Nanchang University, Nanchang Jiangxi 330031, China;
2. School of Materials Science and Engineering, East China Jiaotong University, Nanchang Jiangxi 330031, China

Received:2019-09-20 Online:2020-04-25 Published:2020-05-08

摘要/Abstract

摘要： 对Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁(at%)合金进行了不同温度下的时效处理,利用扫描电镜、X射线衍射仪等对时效后合金的组织和物相进行分析,并运用Origin Peak Fit Module软件进行了晶格常数的测定,同时对经不同温度时效后的合金在室温下进行了硬度和伪弹性的测试。结果表明:保持时效时间60 h不变,当时效温度由600 ℃增加至650 ℃和750 ℃时,晶内由γ′单相析出转为γ′和β两相析出。β相的析出与较高时效温度下Ta元素在基体里的固溶度增加有关。在晶内单相析出模式下,合金在室温下展现伪弹性,可回复应变为10.01%;在晶内双相析出模式下,在室温下展现超弹性,应力滞后小,可回复应变达12.41%。在650 ℃的时效温度下,合金在室温下的伪弹性表现最佳。

关键词: 形状记忆合金, 时效, 伪弹性, Fe-Ni-Co-Al-Ta, 马氏体相变

Abstract: Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁ (at.%) alloy was aging treated at different temperatures. Microstructure observation and phase analysis of the aged alloy were carried out by scanning electron microscopy and X-ray diffractometer, and the lattice parameters were determined through Origin Peak Fit Module software. Meanwhile, the hardness and pseudoelasticity of the alloy aged at different temperatures were measured at room temperature. The results show that, the precipitates in the grain interior change from γ′ phase to γ′ and β phases when the aging temperature increases from 600 ℃ to 650 ℃ and 750 ℃ with 60 h aging time maintained. The precipitation of β phase is related to the increase of solid solubility of Ta element in the matrix at higher aging temperature. In the single-phase precipitation mode, the alloy exhibits pseudoelasticity at room temperature, with a recoverable strain of 10.01%. However, in the two-phase precipitation mode, the alloy exhibits superelasticity at room temperature, with a small stress hysteresis and a recoverable strain of 12.41%. After aging at 650 ℃, the alloy exhibits the best pseudoelasticity at room temperature.

Key words: shape memory alloy, aging, pseudoelasticity, Fe-Ni-Co-Al-Ta, martensitic transformation

中图分类号:

TG166

陈朝霞, 彭文屹. 时效温度对Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁形状记忆合金组织及伪弹性的影响[J]. 金属热处理, 2020, 45(4): 120-123.

Chen Zhaoxia, Peng Wenyi. Effect of aging temperature on microstructure and pseudoelasticity of Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁ shape memory alloy[J]. Heat Treatment of Metals, 2020, 45(4): 120-123.

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时效温度对Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁形状记忆合金组织及伪弹性的影响

Effect of aging temperature on microstructure and pseudoelasticity of Fe_42.5Ni₂₈Co₁₇Al_11.5Ta₁ shape memory alloy

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