Room temperature superelasticity in a lightweight shape memory Mg alloy
Room temperature superelasticity in a lightweight shape memory Mg alloy
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DOI：
10.1016/j.scriptamat.2019.04.023
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发表时间：
2019-07
影响因子：
6
通讯作者：
K. Yamagishi;Y. Ogawa;D. Ando;Y. Sutou;J. Koike
中科院分区：
文献类型：
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作者：
K. Yamagishi;Y. Ogawa;D. Ando;Y. Sutou;J. Koike
为了在室温下实现超弹性的Mg-Sc轻合金，我们研究了室温下马氏体相变起始温度约为 90−°C的Mg-18.7at.%Sc合金板材的应力-应变行为。发现该合金的超弹性强烈依赖于晶粒度，并且在大晶粒度的合金中获得了明显的室温超弹性(~3%超弹性应变)。从相变应变的取向度来看，最大超弹性应变比预期的要小。这一结果表明，由于滑移缺陷的引入，应力诱发马氏体相得到了稳定。
To realize a superelastic Mg-Sc lightweight alloy at room temperature, we investigated the stress–strain behavior of Mg-18.7 at.% Sc alloy sheets at room temperature with martensitic transformation starting temperature of approximately −90 °C. We found that the superelasticity of the alloy strongly depends on the grain size and a distinct room temperature superelasticity (~3% superelastic strain) was obtained in the alloy with a large grain size. The obtained maximum superelastic strain was smaller than that expected from the orientation dependence of the transformation strain. This result suggests that the stress-induced martensite phase was stabilized because of the introduction of slip defects.