摘要
为研究铸态Mg-5Zn-3Nd镁合金在不同轧制变形量下组织和力学性能的变化,利用小型轧机对铸态Mg-5Zn-3Nd合金进行多道次轧制,并进行了微观组织观察和室温拉伸性能测试.结果表明:该镁合金在常温下可进行多道次轧制,但每道次之间要进行330℃×15 min的退火处理,总变形量可达到66%;随总变形量的增加,轧制流线逐渐形成,晶粒的平均尺寸逐渐变小,在许多晶粒内部存在孪晶,在退火过程中发生再结晶.镁合金中Nd主要分布在晶界处的第二相中,并且第二相含Zn较高,材料的强度和塑性均随变形量的增大而增加,当总变形量达到50%以上时,材料的强度和塑性达到极值,抗拉强度为285 MPa,屈服强度为279 MPa,伸长率为7%.
In order to investigate the microstructure and mechanical properties of as-cast Mg-5Zn-3Nd at different rolling reduction, a small rolling machine was used for multi-pass rolling. The corresponding microstructures were observed, and the tensile tests were also performed at room temperature. The results show that the Mg-5Zn-3Nd alloy can be rolled for multi-passes at room temperature with annealing treatment at 330 ℃ for 15 min between each pass, and the total reduction can reach 66%. With increasing the total reduction, the rolling streamline forms gradually, the average grain size decreases, and the twins are observed in many grains. At the same time, the recrystallization occurs during annealing. Nd distributes mainly in the second phase at grain boundaries, and the second phase contains the higher content of Zn. With increasing the reduction, the strength and plasticity of the alloy increase. However, the strength and plasticity approach the maximum values when the total reduction is higher than 50%, where the ultimate tensile strength, yield strength and elongation are 285 MPa, 279 MPa and 7 % respectively.
出处
《沈阳工业大学学报》
EI
CAS
2009年第4期369-373,共5页
Journal of Shenyang University of Technology
基金
辽宁省重点实验室基金资助项目(20060603)
