摘要
采用粉末冶金法在不同热压温度下制备了AZ31镁合金,随后在400℃进行热挤压处理。研究了热压温度对热压-热挤压两步工艺下镁合金显微组织和力学性能的影响。结果表明,直接热压后致密度随热压温度的提高而逐渐升高,550℃热压后致密度达到最高为97.3%。经400℃挤压后镁合金致密度得到进一步提高,达到98.5%以上。随着热压温度的逐渐升高,挤压后的镁合金晶粒逐渐增大,拉伸强度逐渐降低,维氏硬度先升高后降低。
The AZ31 magnesium alloys were prepared under different hot-pressing temperatures by powder metallurgy, and then the alloy was hot extruded at 400 ℃. The effect of hot-pressing temperature on the microstructures and mechanical properties of the AZ31 magnesium alloys derived from hot-pressing and then extrusion was investigated. The results show that the relative density of the hot-pressed alloy increases gradually with the increase of hot-pressing temperature, the maximum of 97.3% is achieved at 550 ℃. After extrusion at 400 ℃, the relative density further increases and exceeds 98.5%. Furthermore, with the increase of hot-pressing temperature, the grain size increase but tensile strength decrease, while Vickers hardness increases first and then decreases.
出处
《铸造技术》
北大核心
2017年第10期2488-2489,2499,共3页
Foundry Technology
关键词
AZ31
粉末冶金
热压
挤压
力学性能
AZ31
powder metallurgy
hot-pressing
extrusion
mechanical properties
