挤压温度对喷射成形Zn-Al-Mn-Cu-Mg合金组织与力学性能的影响

Effect of Extrusion Temperature on Microstructure and Mechanical Properties of Spray Forming Zn-Al-Mn-Cu-Mg Alloy

本试验利用喷射成形工艺制备Zn-Al-Mn-Cu-Mg合金,研究了挤压温度对喷射成形合金材料的微观组织及力学性能的影响。结果表明,挤压温度为280℃时,喷射成形Zn-Al-Mn-Cu-Mg合金晶粒细小,挤压温度升高,合金组织逐渐粗化,并析出富锰化合物ZnAlMn6。在研究条件下,喷射成形Zn-Al-Mn-Cu-Mg合金经280℃挤压,抗拉强度和伸长率均最高,分别为496.9 MPa和5.31%;而经320℃挤压后,合金的抗拉强度和伸长率均最低,分别为441.2 MPa和3.40%,合金硬度并不随着挤压温度提高发生明显变化。喷射成形Zn-Al-Mn-Cu-Mg合金适宜的热挤压温度为280℃左右,合金具有良好的力学性能。

The Zn-Al-Mn-Cu-Mg alloy was fabricated by using of spray forming process,and the effects of extrusion temperature on the microstructure and mechanical properties of alloy were investigated.The results show that when the extrusion temperature increased from 280 ℃ to 320 ℃,the grain size coarsened with the precipitation of ZnAlMn6 as Mn-riched compound,and the tensile strength and elongation decreased from 496.9 MPa and 5.31% to 441.2 MPa and 3.40%,respectively.But the hardness of alloy was not change significantly with the increasing of extrusion temperature.It is found that spray forming Zn-Al-Mn-Cu-Mg alloy has excellent mechanical properties at appropriate extrusion temperature of about 280 ℃.