LY12合金低温拉伸变形行为研究  

Tensile Deformation Behavior of LY12 Alloy at Low Temperature

作　　者：王东宁[1] 吕占江 王淑花[3] 

机构地区：[1]哈尔滨汽轮机有限责任公司,黑龙江哈尔滨150046 [2]中国联通哈尔滨分公司,黑龙江哈尔滨150000 [3]黑龙江科技学院材料学院,黑龙江哈尔滨150027

出　　处：《热加工工艺》2007年第10期28-29,34,共3页Hot Working Technology

摘　　要：对人工时效后的LY12合金进行了不同温度系列拉伸试验,采用SEM和光镜对断口及其附近的显微组织进行观察,研究了温度对LY12合金拉伸变形行为的影响。结果表明,LY12合金正常时效时析出相的主要成分为Al2CuMg,随温度的逐步降低,析出相发生脆性断裂的可能性更大。同时析出相与基体分离需要吸收更多外界能量,从而使LY12合金的抗拉强度与屈服强度随温度的逐步降低单调增加;随温度的逐步降低,析出相的脆性断裂降低了对位错的阻碍作用,使位错滑移距离增长,因此材料的伸长率呈增长趋势。The LY12 alloy aider artificial aging was carded out tensile test at different temperature.The fracture and the microscopic structure near fracture were obsered by SEM and metallographic microscope, the influnce of temperature on tensile deformation behavior of LY12 alloy was researched .The results show that the main composition of LY12 alloy precipitation is Al2CuMg, and the possibility of brittle rapture of precipitation in LY12 alloy increases with temperature gradually reducing. At the same time, it needs more energy to separate precipitation and matrix. As the result, the tensile strength and yield strength increase monotonously as the temperature gradually reducing,and the brittle rupture of precipitation reduces counteract effect to dislocation, the dislocation slipping distance increases, so the elongation of the material exhibits increasing tendency.

关 键 词：LY12合金 低温拉伸 微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]