预挤压对AZ80模锻件的组织和力学性能的影响  

Influence of pre-extrusion on microstructure and mechanical properties of die forged AZ80 magnesium alloy

作　　者：王振[1] 朱秀荣[1] 王荣[1] 龚朝辉[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《兵器材料科学与工程》2011年第2期80-83,共4页Ordnance Material Science and Engineering

摘　　要：通过对AZ80变形镁合金的模锻坯料进行挤压比为4的预挤压处理,研究挤压预变形对AZ80模锻件的组织和力学性能的影响。结果表明,预挤压处理的模锻样品时效时,以晶界颗粒状连续析出β相为主,而铸锭直接模锻的β相时效析出,则以晶内大量层片状不连续析出为主。经过挤压预变形的AZ80模锻件相比铸锭直接模锻件,其模锻态和T5态的抗拉强度、伸长率得到明显提高,屈服强度变化不明显,脆性断裂明显减少,出现大量韧窝。The influence of pre-extrusion（extrusion ratio is 4） on microstructure and mechanical properties of die forged AZ80 was studied.The results show that granular sequence β-phase of pre-extruded and die forged AZ80 after T5 separates out at grain boundary,the layered non-sequence β-phase of die forged cast AZ80 after T5 separates out in crystalline.Compared with that of die forged cast AZ80,the tensile strength and elongation of die forged and T5 specimen after pre-extrusion are obviously increased,the yield strength has little changes,brittle fracture decreases obviously,and lots of dimples appear.

关 键 词：镁合金 挤压 锻造 微观结构 

分 类 号：TG146.22[一般工业技术—材料科学与工程]