挤压速率对流变挤压铸造铜合金轴套零件组织和力学性能的影响  

Effect of Extrusion Rate on Microstructure and Mechanical Property of Copper Alloy Prepared by Rheological Squeeze Casting

作　　者：陈泽邦 肖寒[1] 李乃拥 周荣锋[1] 卢德宏[1] 周荣[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《材料研究学报》2018年第1期73-80,共8页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51665024);云南省应用基础研究面上项目(2014FB131);云南省教育厅科学研究基金重点项目(2015Z031)~~

摘　　要：采用流变成形技术,采取冷轧-重熔的应变诱导熔化激活法(SIMA)制备流变浆料,研究挤压速率对流变挤压铸造ZCuSn10P1铜合金轴套零件组织和力学性能的影响,探讨ZCuSn10P1铜合金充型流动过程中固液两相的演变规律。结果表明:在成形比压为250 MPa,挤压速度为15 mm/s时,流变挤压铸件的组织较均匀,固液协同流动性最好。此时,抗拉强度达到最大值371.1 MPa,延伸率为8.43%,与液态挤压铸件相比,其抗拉强度、延伸率分别提高了57.3%、78.7%。在流变挤压铸造ZCuSn10P1铜合金轴套零件过程中,不仅垂直方向上存在液相偏析现象,且在水平方向上也会出现液相偏析现象。Strain induced melt activation（SIMA） based on cold rolling and remelting method is used to prepare the rheological slurry, then with which axle bush parts of Cu alloy ZCuSn10P1 were prepared by rheological squeeze casting process. Whilst the effect of extrusion rate on the microstructure and mechanical property of the prepared copper alloy, and the evolution of solid and liquid phases during the forming process were studied. The results indicate that with the forming specific pressure of 250 MPa and extrusion rate of 15 mm/s, the microstructure of the prepared Cu-alloy ZCuSn10P1 is uniform and the synergy liquidity of solid-liquid is considerable, thereby, the tensile strength of the Cu-alloy reached a peak value of 371.1 MPa and elongation of 8.43%, which are 57.3% and 78.7% respectively higher than those of the Cu-alloy prepared by liquid-phase extrusion casting process. Furthermore, it is noted that liquid-phase segregation phenomenon along not only the vertical direction, but also the horizontal direction could be observed in the microstructure of the prepared axle bush parts by the rheological squeeze casting process.

关 键 词：金属材料 铜合金 流变挤压 组织演变 半固态 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG249.9[金属学及工艺—金属材料]