摘要
通过在汽车用AM50合金凝固过程中施加不同机械振幅的方法,研究了机械振幅分别为0、0.5、1、1.5、2和2.5 mm时对AM50合金的金相组织、夹杂物形貌与分布特征和力学性能的影响。结果表明,在合金凝固过程中施加机械振动,可以对合金中的析出相和晶粒起到明显的细化作用;随着机械振幅的增加,合金中圆形夹杂物的比例在不断减小,而条形和多角形夹杂物的比例在不断增加;当机械振幅增加至2.5 mm时,AM50合金的抗拉强度、屈服强度和断后伸长率分别达到234 MPa、111 MPa和4.5%,相对未施加振动的AM50合金分别增加了25.8%、29.1%和128%。
The mechanical amplitude was conducted on AM50 alloy in the solidification process, and the effects of different mechanical amplitudes （0mm, 0.5mm, 1mm, 1.5mm, 2mm and 2.5mm ） on the optical microstructure, inclusion and mechanical properties of the AM50 alloy were studied. The results show that, mechanical amplitude has obvious refinement effect on the precipitates and the grains in the alloy; with the increase of mechanical amplitude, the proportion of circular inclusions in the alloy decreases constantly, but the proportion of strip and polygonal inclusions are constantly increased.When the mechanical amplitude increases to 2.5mm, the tensile strength, yield strength and elongation of AM50 alloy reach to 234 MPa, 111 MPa and 4.5 % respectively, increasing by 25.8 %, 29.1% and 128 %.relatively compared with the non-vibration alloy.
出处
《热加工工艺》
CSCD
北大核心
2016年第15期98-101,共4页
Hot Working Technology
关键词
机械振动
AM50合金
组织
夹杂物
力学性能
mechanical vibration
AM50 alloy
microstructure
inclusion
mechanical properties
