高精度AZ31镁合金薄壁管件等温挤压后的组织与性能
Microstructure and Mechanical Properties of Thin Wall AZ31 Magnesium Alloy Pipes with High Precision Prepared by Isothermal Extrusion Technology
石 磊1, 李继文1,2, 李永兵3, 魏世忠1,2
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作者单位:(1.河南科技大学 材料科学与工程学院, 河南 洛阳 471003; 2. 河南科技大学 河南省耐磨材料工程技术研究中心, 河南 洛阳 471003; 3. 机械科学研究总院 先进制造技术研究中心, 北京 100083)
中文关键字:AZ31镁合金; 等温挤压; 组织; 性能
英文关键字:AZ31 magnesium alloy; isothermal extrusion; microstructure; properties
中文摘要:研究了不同条件下AZ31镁合金管材的等温挤压情况,并对挤压前后材料组织与力学性能的变化进行了分析。研究结果表明,AZ31镁合金热挤压时发生了动态再结晶, 材料组织比铸态时细化, 力学性能大幅度提高; 在(653 ± 10) K挤压温度范围内金属流动均匀, 挤出管材尺寸精度较高, 力学性能良好; 从综合性能看, AZ31镁合金挤压产品的合适退火工艺为573 K × 2 h; 此时管材的机械拉伸强度为260 MPa, 伸长率为23%。
英文摘要:AZ31 magnesium alloy was hot-extruded under different conditions, and the microstructure and mechanical properties of the alloy before and after hot extrusion were investigated. The results show that dynamic recrystallization occurs during hot-extrusion, therefore, compared to the as-cast alloy, the microstructure of extruded AZ31 alloy are refined, and the mechanical properties are remarkably enhanced; The AZ31 magnesium alloy extruded at (653±10)K can gain dimensions accuracy and good plasticity. In terms of comprehensive properties, the suitable annealing technics of AZ31 magnesium alloy is 573K× 2 h. The tensile-strength of AZ31 magnesium alloy pipes is 260 MPa, its elongation is 23%.