Enhancing compressive mechanical properties of rolled AZ31 Mg alloy plates by pre-compression-猫眼课题宝

预压缩提高AZ31镁合金轧制板的压缩力学性能

DOI：

10.1016/j.msea.2019.138686

发表时间：

2020-01

期刊：

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing

影响因子：

6.4

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

Zhang Hua;Bai Xiaoqing;Hou Minjian;Wang Lifei;Zhang Qiang;Fan Jianfeng;Wu Yucheng;Dong Hongbiao;Xu Bingshe

通过室温（RT）预压缩，在热轧AZ 31镁合金板材中沿横向（TD）沿着预引入{10-12}形变孪晶。预引入{10-12}形变孪晶显著提高了AZ 31镁合金板材的屈服强度，且不影响板材的压缩比。特别是在室温、100 ℃和200 ℃下，含有{10-12}延伸孪晶的预压缩样品表现出比初始样品大得多的屈服强度（122 MPa对66 MPa、121 MPa对64 MPa和118 MPa对63 MPa）。在200 °C下，预压缩试样比初始试样表现出更明显的压缩流动软化现象，这归因于预引入的{10-12}拉伸孪晶加速了动态再结晶过程。在300 °C下压缩时，初始和预压缩试样的压缩流变曲线趋于一致，这是由于两种试样均以不连续动态再结晶（DDRX）为控制机制，预引入的{10-12}延伸孪晶的影响消失。

{10–12} extension twins were pre-introduced in the hot-rolled AZ31 Mg alloy plates by pre-compression at room temperature (RT) along the transverse direction (TD). Pre-introduced {10–12} extension twins substantially improved the yield strength of AZ31 Mg alloy plates and did not deteriorate the compression ratio. Especially at RT, 100 °C and 200 °C, the pre-compressed samples containing {10–12} extension twins exhibited much larger yield strength (122 MPa vs. 66 MPa, 121 MPa vs. 64 MPa and 118 MPa vs. 63 MPa) than the initial samples. The pre-compressed sample showed more obvious compression flow softening phenomenon than the initial sample at 200 °C, which was attributed to the dynamic recrystallization (DRX) process accelerated by pre-introduced {10–12} extension twins. When compressing at 300 °C, the compression flow curves of the initial and pre-compressed samples tended to coincidence, which was because the discontinuous dynamic recrystallization (DDRX) was the controlling mechanism in both kinds of the samples and the effect of pre-introduced {10–12} extension twins was vanished.