High strain-rate superplasticity of AZ91 alloy achieved by rapidly solidified flaky powder metallurgy
High strain-rate superplasticity of AZ91 alloy achieved by rapidly solidified flaky powder metallurgy
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DOI：
10.1016/j.matlet.2018.09.090
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发表时间：
2019-01
影响因子：
3
通讯作者：
Taekyung Lee;M. Yamasaki;Y. Kawamura;Yongmoon Lee;C. Lee
中科院分区：
文献类型：
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作者：
Taekyung Lee;M. Yamasaki;Y. Kawamura;Yongmoon Lee;C. Lee
采用快速凝固粉末冶金技术（RS FP/M）成功地实现了AZ 91镁合金的高应变速率超塑性。RS FP/M AZ 91在623 K的温度和10−2s−1的初始应变速率下的断裂伸长率分别为465%。此外，获得最大延伸率的最佳超塑性应变速率为10 - 2s-1，这高于其他方法获得的应变速率。在本研究中获得的HSRS归因于一个有效的晶粒细化（~ 1 μm）和高的热稳定性。双峰晶粒结构可能进一步有助于HSRS。
In this study, the authors successfully obtained high strain-rate superplasticity (HSRS) for an AZ91 Mg alloy using rapidly solidified flaky powder metallurgy (RS FP/M). The RS FP/M AZ91 shows an elongation to failure of 465% at a temperature and initial strain rate of 623 K and 10−2s−1, respectively. Furthermore, the optimum superplastic strain rate for the maximum elongation was 10−2s−1, which is higher than those attained by other methods. The HSRS obtained in this study is attributed to an effective grain refinement (∼1 μm) and high thermal stability. The bimodal grain structure may further contribute to HSRS.