锻压技术

挤压温度对汽车用新型镁合金组织和性能的影响

英文标题：Influence of extrusion temperature on microstructure and properties of new magnesium alloy for automobile

作者：白云

单位：重庆工业职业技术学院

分类号：TG146.2

出版年,卷(期):页码：2018,43(4):146-148

摘要：

为了研究挤压温度对汽车用Mg-Al-Zn-Ti新型镁合金组织和性能的影响，分别采用5种挤压温度进行了汽车用Mg-Al-Zn-Ti新型镁合金的挤压试验，并进行了显微组织和力学性能的测试和分析。结果表明：随着挤压温度从230 ℃增至350 ℃，合金的平均晶粒尺寸先减小后增大，其抗拉强度和屈服强度均呈现先升高后降低的变化趋势，而断后伸长率在较小变化范围内呈现先降低后升高的变化趋势。挤压温度为320 ℃时，合金的晶粒尺寸降至最小，其力学性能表现最佳，较230 ℃挤压时平均晶粒尺寸减小约9 μm，抗拉强度和屈服强度分别增大31和32 MPa。因此，汽车用Mg-Al-Zn-Ti新型镁合金的挤压温度优选为320 ℃。

To study the influences of extrusion temperature on microstructures and properties of new type magnesium alloy Mg-Al-Zn-Ti for automotive, the extrusion tests of new magnesium alloy Mg-Al-Zn-Ti for automotive were conducted at five different extrusion temperatures, and the microstructures and mechanical properties were tested and analyzed. The results show that with the increasing of extrusion temperature from 230 ℃ to 350 ℃, the average grain size of alloy decreases first and then increases, both tensile strength and yield strength increase first and then decrease, while the elongation after fraction decreases first and then increases within a smaller range. Furthermore, at the extrusion temperature of 320 ℃, the grain size of alloy decreases to the smallest, and the mechanical properties reach the best. Comparing with the alloy extruded at 230 ℃, the average grain size is reduced by about 9 μm, and the tensile strength and yield strength are increased by 31 and 32 MPa, respectively. Therefore, the optimal extrusion temperature of new magnesium alloy Mg-Al-Zn-Ti for automotive is preferably 320 ℃.

基金项目：

重庆市教委科学技术研究项目（KJ1503105）

白云（1983-），女，硕士，讲师；E-mail：33941088@qq.com

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