冷热循环工艺中冷热转移速率对LY12铝合金尺寸稳定性的影响  

EFFECT OF THERMAL-COLD TRANSFORMATION RATE ON DIMENSIONAL STABILITY OF LY12 ALUMINIUM ALLOY IN THERMAL-COLD CYCLING PROCESS

作　　者：杨峰[1] 武高辉[1] 孙东立[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《上海金属》2003年第1期1-3,21,共4页Shanghai Metals

摘　　要：研究了冷热转移速率对LY1 2铝合金微屈服强度和残余应力的影响。结果表明 ,提高冷热转移速率易使材料中形成稳定的位错组态 ,从而有利于提高微屈服强度 ;对于圆柱和圆环试样 ,提高冷热转移速率不利于降低残余应力。分析认为 ,冷热转移速率应根据工件几何形状和尺寸进行相应调整。The effects of thermal-cold transformation rate on the micro-yield strength and residual stress of LY12 aluminium alloy were studied.The results showed that raising thermal-cold transformation rate was favorable for the formation of stable dislocation structure in material,therefore,to improve the micro-yield strength.For the cylinder and ring specimens,raising thermal-cold transformation rate was not favorable for relaxing the residual stress.It was considered through analysis that the thermal-cold transformation rate should be adjusted according to the geometric shape and dimension of the work pieces.

关 键 词：冷热循环工艺 冷热转移速率 LY12铝合金 尺寸稳定性 微屈服强度 残余应力 

分 类 号：TG166.3[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]