Development of Mg-Based Superelastic Alloy Through Aging Heat Treatment
Development of Mg-Based Superelastic Alloy Through Aging Heat Treatment
复制标题
时效热处理镁基超弹性合金的研制
DOI：
10.1007/978-3-031-22645-8_34
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Y. Sutou
中科院分区：
文献类型：
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作者：
K. Yamagishi;Y. Ogawa;D. Ando;Y. Sutou
本文研究了时效处理对Mg-18.8at.%合金的显微组织、硬度和室温超弹性的影响钪合金。通过在423 - 523 K之间的温度下进行时效热处理，合金的硬度从~ 90 Hv（淬火状态）增加到最大180 Hv。在较高温度下进行时效处理可缩短时效硬化开始前的孕育时间。扫描电镜观察和X射线衍射分析表明，六方密排（α）相在体心立方（β）基体相中析出导致时效硬化，硬度值与α相的体积分数几乎呈线性关系。当α相体积分数约为10%时，时效处理形成的α相可沿着β基体相发生应力诱发马氏体相变，与淬火态相比，应力滞后略有减小，超弹性回复略有增加。
The effect of agingheat treatment on microstructure, hardness, and superelasticity at room temperature was investigated herein for Mg-18.8 at.% Sc alloy. The hardness of the alloy is increased via agingheat treatment at temperatures between 423 and 523 K, from ~ 90 Hv (as-quenched condition) to a maximum of 180 Hv. Agingheat treatment at a higher temperature reduces the incubation time before the onset of age hardening. Scanning electron microscopy observations and X-ray diffraction analysis showed that the precipitation of hexagonal close-packed (α) phases within the body-centered cubic (β) matrix phase causes age hardening and the hardness value almost depends linearly on the volume fraction of α precipitates. Furthermore, the α precipitates formed via agingheat treatment can be deformed along with β matrix phase upon stress-induced martensitic transformation in a sample with ~ 10% volume fraction of α precipitates, resulting in a slight reduction in stress hysteresis and a minor increase in superelastic recovery compared with the as-quenched condition.