摘要
采用熔铸、挤压的方法制备了Zn-1.0Cu-0.2Ti(简称ZCT)和Zn-1.0Cu-0.2Ti-0.05Mg(简称ZCTMg)两种变形锌合金,分析了两种合金的相组成,观察了合金的微观组织,测试了合金的拉伸性能和蠕变性能,研究了合金的微观组织和性能之间的关系。结果表明,ZCT和ZCTMg两种合金均主要由η相、ε相和TiZn15相组成;ZCTMg合金的铸态组织较ZCT有一定细化,挤压态合金的抗拉强度由ZCT的212.35MPa提高到ZCTMg的248.90MPa;ZCTMg合金的抗蠕变性能较ZCT合金有明显提高,合金稳态蠕变速率由ZCT的2.17×10-5s-1降低到ZCTMg的3.68×10-7s-1,晶界上的微纳米级TiZn15相粒子和较大的晶粒是提高合金蠕变性能的主要原因。
Zn-1.0Cu-0.2Ti（ZCT）and Zn-1.0Cu-0.2Ti-0.05Mg（ZCTMg） wrought zinc alloys were prepared by melt casting combining with extruding process. Phase compositions, microstructure, tensile behavior and creep behavior of the two alloys prepared were analyzed by OM （optical microscope）, SEM （scanning electron microscope） and tensile testing. Relationship between microstructure and properties of the alloys prepared were described. The results show that both ZCT alloy and ZCTMg alloy mainly consist of η phase、ε phase and TiZn15 phase. Compared with those of ZCT alloy, as-cast microstructure of ZCTMg is refined to some extent, and tensile strength is increased from 212.35 MPa of the extruded ZCT alloy to 248.90 MPa of the extruded ZCTMg. Creep resistance of the ZCTMg alloy is superior evidently to that of ZCT alloy, and the steady-state creep rate is decreased to 3.68×10-7 s-1 from 2.17×10-5 s-1 of ZCT alloy at 130 MPa, which are attributed to nano- TiZn15 phase located at grain boundary and coarse grain size.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2012年第11期1054-1058,共5页
Special Casting & Nonferrous Alloys
基金
国家"十一五"科技支撑计划项目(2009BAE71B00)
关键词
Zn-Cu-Ti合金
组织
性能
拉伸
蠕变
Zn-Cu-Ti Alloy
Microstructure
Properties
Tensile Behavior
Creep
