半固态挤压铸造铜合金的组织和力学性能

Microstructure and Mechanical Properties of Semi-Solid Squeeze Casting Copper Alloy

以半固态ZCuSn10P1铜合金为研究对象,自主设计了1套1模4件挤压模具并进行了半固态挤压铸造成形实验,研究了成形比压和挤压速率对半固态ZCuSn10P1铜合金挤压铸造组织和性能的影响规律。结果表明:当成形比压由180 MPa增加到250 MPa时,半固态铜合金平均晶粒直径逐渐减小,由89.25μm减小至77.96μm,液相率由36.7%减少至22.3%,抗拉强度由318 MPa增加至387 MPa,提高了21.70%,延伸率由4.2%降至2.8%;当挤压速率由11 mm/s增加至15 mm/s时,固相晶粒圆整度由1.54减小至1.32,此时抗拉强度由368 MPa增加至387 MPa,提高了5.16%,延伸率由3.3%降低至2.8%。

A semi-solid ZCuSn10P1 copper alloy was used as the research object.A four-piece extrusion mold was independently designed.The semi-solid squeeze casting experiments were carried out.The effects of forming specific pressure and extrusion rate on microstructure and mechanical property of semi-solid ZCuSn10P1 copper alloy squeeze casting parts were investigated.The results show that with the specific pressure increases from 180 MPa to 250 MPa,the average diameter of the solid phase of semi-solid copper alloy decreases gradually from 89.25 μm to 77.96 μm,and the liquid fraction decreases from 36.7% to 22.3%,tensile strength increases from 318 MPa to 387 MPa with an increase amplitude of 21.70%,and the elongation decreases from 4.2% to 2.8%.When the extrusion rate increases from 11 mm/s to 15 mm/s,the roundness of the solid phase is reduced from 1.54 to 1.32,the tensile strength increases from 368 MPa to 387 MPa,increased by 5.16%,and the elongation decreases from 3.3% to 2.8%.