Microstructure, mechanical properties and static recrystallization behavior of the rolled ZK60 magnesium alloy sheets processed by electropulsing treatment
Microstructure, mechanical properties and static recrystallization behavior of the rolled ZK60 magnesium alloy sheets processed by electropulsing treatment
复制标题
电脉冲处理轧制ZK60镁合金板材的显微组织、力学性能及静态再结晶行为
DOI：
10.1016/j.jallcom.2015.04.196
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发表时间：
2015-10-15
影响因子：
6.2
通讯作者：
Xu, Bingshe
中科院分区：
文献类型：
--
作者：
Jin, Wei;Fan, Jianfeng;Xu, Bingshe
研究了电脉冲处理（EPT）对轧制ZK60镁合金板材显微组织、力学性能和静态再结晶（SRX）行为的影响。实验结果表明，与常规热处理（RHT）相比，EPT加工的ZK60合金轧制板材更容易出现SRX。此外，脉冲宽度为22-25μs的EPT使再结晶组织细化，综合力学性能得到极大提高。晶粒尺寸由100μm细化至2μm，ZK60合金板材的拉应力由210MPa提高到320MPa，拉伸伸长率由15.7%提高到30%。通过实测温度分析和傅里叶传热模型的理论计算，讨论了EPT引起的焦耳热对再结晶行为的影响。此外，基于亚晶聚结理论研究了EPT下的SRX机理。 EPT 通过亚晶粒聚结机制加速无应变晶粒的成核。由 EPT 而不是焦耳热引起的附加能量 G(e) 增加了再结晶的驱动力。 (C) 2015 Elsevier B.V. 保留所有权利。
Influences of electropulsing treatment (EPT) on microstructure, mechanical properties and static recrystallization (SRX) behavior of the rolled ZK60 magnesium alloy sheets were investigated. The experimental results indicated that the SRX of the rolled ZK60 alloy sheets processed by EPT was liable to occur compared with that processed by routine heat treatment (RHT). Furthermore, the recrystallization microstructure was refined and the comprehensive mechanical properties were improved tremendously by EPT with a pulse width of 22-25 mu s. The grain size was refined from 100 mu m to 2 mu m, the tensile stress of ZK60 alloy sheets was improved from 210 MPa to 320 MPa and the tensile elongation was increased from 15.7% to 30%. Analyses on measured temperature and theoretical calculation of Fourier heat transfer model were carried out to discuss the effect of Joule heat induced by EPT on recrystallization behavior. Moreover, the SRX mechanism under EPT was studied based on subgrain coalescence theory. EPT accelerated the nucleation of strain-free grains by subgrain coalescence mechanism. An additional energy G(e) induced by EPT rather than Joule heat increased the driving force of recrystallization. (C) 2015 Elsevier B.V. All rights reserved.