摘要
为了满足航天飞行器对结构减重的迫切需求,推动变形镁合金在航天飞行器上的应用,采用力学性能测试及显微组织分析的方法对高强耐热镁合金工业级大型锻件进行了研究。研究结果表明:锻前固溶处理不能完全消除晶间稀土元素的偏析,这些稀土元素最终以Mg24Y5、Mg5Gd等相的形式保留下来,并呈现出颗粒形态;锻环力学性能的各向异性随着变形温度的提高而降低;低于250℃时,该合金的断口呈现出准解理和韧性撕裂的混合特征,随着温度的升高,韧性断裂的比重逐渐加大,当变形温度提高到300℃时,呈现出韧窝聚集形断裂特征。
In order to meet the urgent needs of structural weight reduction of spacecraft and promote the applications of wrought magnesium alloys on spacecraft, mechanical property testing and microstructure analysis were applied to investigate the large-scale high-strength and heat-resistant magnesium alloy. The results show that the segregation of rare-earth can not be removed, which has been changed to the phases like Mg24 Y5. MgsGd. The anisotropism of the forging ring is weakened and the specific weight of tough fracture is increased as the temperature is increased. The fracture model is tough fracture when the temperature is 300 ℃.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2013年第5期65-68,共4页
Materials Science and Technology
基金
国防基础科研计划资助项目(A0320110003)
关键词
镁合金
锻造
时效处理
力学性能
显微组织
偏析
magnisum alloy
forging
aging treatment
mechanical property
microstructure
segregation
