Improvement in cold formability of AZ31 magnesium alloy sheets processed by equal channel angular pressing
Improvement in cold formability of AZ31 magnesium alloy sheets processed by equal channel angular pressing
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DOI：
10.1016/j.jmatprotec.2014.11.029
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发表时间：
2015-03
影响因子：
6.3
通讯作者：
J. Suh;J. Victoria-Hernández;D. Letzig;R. Golle;S. Yi;J. Bohlen;W. Volk
中科院分区：
文献类型：
--
作者：
J. Suh;J. Victoria-Hernández;D. Letzig;R. Golle;S. Yi;J. Bohlen;W. Volk
研究了AZ31镁合金板材等通道转角挤压（ECAP）后的显微组织、织构发展和力学性能。结果与不同温度下单道次ECAP后的室温成形行为相关。开发了一种新型ECAP工具，用于对尺寸为200 × 200 × 1. 8 mm3的板材进行ECAP变形。在175、200和225 °C三个温度下使用130°的通道角成功地进行了ECAP试验。经过ECAP变形后，AZ31镁合金板材的晶粒得到明显细化，织构发生了明显变化。特别地，在225 °C下在ECAP处理的片材中观察到动态再结晶。室温拉伸试验表明，随着加工温度的升高，沿压制方向（PD）的均匀延伸率（沿着）增加。在室温下的最高均匀应变在225 °C下的ECAP化片材中为17.6%。室温下的U形截面成形试验表明，与轧制状态相比，225 °C下的ECAP板的拉深深度提高了50%以上。
The microstructure, texture development and mechanical properties of AZ31 magnesium alloy sheets processed by equal channel angular pressing (ECAP) were investigated in this work. The results were correlated with the forming behavior at room temperature after single ECAP pass at different processing temperatures. A novel tool was developed for the implementation of ECAP to deform sheets with dimension of 200 × 200 × 1.8 mm3. ECAP trials were carried out successfully at three temperatures of 175, 200 and 225 °C using a channel angle of 130°. After the ECAP process, significant grain refinement and texture changes occurred in the AZ31 sheets. In particular, dynamic recrystallization was observed in the ECAPed sheets at 225 °C. The tensile tests at room temperature showed that uniform elongation along the pressing direction (PD) increased with increasing processing temperature. The highest uniform strain at room temperature was 17.6% in the ECAPed sheet at 225 °C. Forming tests of a U-channel section at room temperature revealed that the drawing depth of the ECAPed sheet at 225 °C was improved by more than 50% as compared with the as-rolled condition.