摘要
利用快速凝固和往复挤压制备细晶ZK60合金,并研究合金的组织与力学性能。结果表明,快速凝固薄带晶粒尺寸为1~8μm,2道次往复挤压后,合金晶粒尺寸为3μm,大量10-50 nm的颗粒从基体析出。随着挤压道次增加,沉淀颗粒增多,晶粒未进一步细化;2道次挤压后,合金抗拉强度高达319 MPa;屈服强度随挤压道次增加而增加,经6道次挤压,屈服强度为253 MPa,伸长率和硬度随挤压道次增加变化不大,分别为（7±1）%和（77±1）HV5。力学性能好归因于晶粒细化和弥散分布在基体上细小颗粒的强化作用。
Fine-grained ZK60 alloy was prepared by rapid solidification and reciprocating extrusion（RE）,and its microstructure and mechanical properties were studied.The results show that the grain sizes of rapidly solidified ribbons are 1-8 μm.After 2 RE passes the grain size is 3 μm and large numbers of nano-scaled particles with sizes of 10-50 nm precipitate from matrix.The amount of precipitates increases with increasing RE passes,however,the grain size is not further refined.The maximum ultimate tensile strength of 319 MPa is achieved after 2 RE passes.The yield strength increases with increasing RE passes;after 6 RE passes the yield strength is 253 MPa.The elongation and hardness are round（7±1）% and（77±1） HV5,respectively;and the variations of them are small with increasing RE passes.Good mechanical properties are attributed to grain refinement and the reinforcement of the dispersedly distributed strengthening particles within matrix.
出处
《金属热处理》
CAS
CSCD
北大核心
2011年第7期5-9,共5页
Heat Treatment of Metals
基金
教育部博士点基金(20070700003)
河南省科技攻关项目(102102210031)
河南省教育厅自然科学基金(2010A430008)
关键词
ZK60镁合金
快速凝固
往复挤压
力学性能
ZK60 magnesium alloy
rapid solidification
reciprocating extrusion
mechanical properties
