锻压技术

轧制方向对Mg-3.5Zn-0.8Ca镁合金薄板显微组织和力学性能的影响

英文标题：Influence of rolling direction on microstructure and mechanical properties for Mg-3.5Zn-0.8Ca magnesium alloy sheet

作者：张显

单位：重庆工贸职业技术学院机电工程系

关键词：镁合金轧制方向织构各向异性力学性能显微组织

分类号：TG146.2

出版年,卷(期):页码：2019,44(10):163-169

摘要：

为研究轧制方向对汽车轻量化用冷轧镁合金薄板质量的影响，通过光学显微镜、EBSD方法和拉伸力学实验，分析了380 ℃退火后不同轧制方向的8道次冷轧Mg-3.5Zn-0.8Ca镁合金板材的显微组织和力学性能。研究结果表明：Mg-3.5Zn-0.8Ca镁合金冷轧后形成了薄板孪晶，生成最多孪晶相的是RD冷轧薄板；380 ℃退火1.5 h处理可以使组织中晶粒尺寸细化，各个轧制方向下晶粒尺寸基本都为20 μm；组织转变为再结晶组织，同时，还有大量晶粒出现了粒径长大的现象；试样在RD方向上的屈服强度比TD方向更高，采用单向轧制方法得到的退火薄板在轧制方向上屈服强度最大，与轧制方向垂直的退火薄板的屈服强度最低。

In order to research the influence of rolling direction on the quality of cold-rolled magnesium alloy sheet for car lightweight, the microstructure and mechanical properties of eight-pass cold-rolled Mg-3.5Zn-0.8Ca magnesium alloy sheet in different rolling directions after annealing at 380 ℃ were analyzed by optical microscope, EBSD method and tensile mechanics experiment. The results show that after cold rolling of Mg-3.5Zn-0.8Ca alloy, the twin crystals are formed in thin plate, and the RD cold rolled sheet generates the most twin phases. The grain size in the microstructure can be refined when the annealing is at 380 ℃ for 1.5 h, the grain size is almost 20 μm in each rolling direction, and the structure has been transformed into recrystallized structure. At the same time, many grains have grown up, and the yield strength of sample in the RD direction is higher than that in the TD direction. Thus, the annealed sheet metal obtained by the one-way rolling reaches the maximum yield strength in the rolling direction, and the annealed sheet metal perpendicular to the rolling direction reaches the lowest yield strength.

基金项目：

作者简介：张显（1985-），男，学士，讲师 E-mail：16638321@qq.com

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