Enhanced strength and plasticity of Mg–6Zn–0.5Zr alloy by low-temperature indirect extrusion
Enhanced strength and plasticity of Mg–6Zn–0.5Zr alloy by low-temperature indirect extrusion
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DOI：
10.1016/j.jallcom.2017.02.206
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发表时间：
2017-06
影响因子：
6.2
通讯作者：
B. Kim;Soo-Min Baek;J. G. Lee;S. Park
中科院分区：
文献类型：
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作者：
B. Kim;Soo-Min Baek;J. G. Lee;S. Park
研究了采用人工冷却方式对Mg-6 Zn-0. 5 Zr合金进行低温间接挤压后的组织和拉伸性能。显着的晶粒细化，通过人工冷却的应用程序，导致在室温下的屈服强度高达53 MPa的增加，相比的情况下（245 MPa）的间接挤压没有人工冷却。除此之外，这种细晶合金在高温下具有超塑性，在200 °C下，应变速率为2 × 10−4-1 × 10−3s−1时的拉伸伸长率为720-810%。高强度和超塑性性能的机制进行了讨论。
The microstructure and tensile properties of Mg–6Zn–0.5Zr alloy processed by low-temperature indirect extrusion utilizing artificial cooling were investigated. Remarkable grain refinement was obtained by the application of artificial cooling, resulting in an increase in the yield strength of as much as 53 MPa at room temperature, as compared to the case (245 MPa) of indirect extrusion without artificial cooling. Besides this, the fine-grained alloy was found to have superplastic properties at elevated temperature, revealing tensile elongations of 720–810% at 200 °C at strain rates of 2 × 10−4–1 × 10−3s−1. Mechanisms responsible for the high strength and superplastic properties are discussed.