高能球磨与热挤压制备Al-Pb-Si-Sn-Cu轴瓦合金

Al-Pb-Si-Sn-Cu Bearing Alloy Synthesized by High Energy Ball Milling and Hot Extrusion

采用机械合金化、冷压与热挤压法制备了Al-15%Pb-4%Si-1%Sn-1.5%Cu(质量分数)轴瓦合金。实验结果表明,合金中Pb 晶粒为纳米晶,Al 以2 种形态存在于合金体系中,一部分为亚微米晶体,另一部分为非晶相。合金的抗压强度和硬度值都随热挤压温度的升高而降低;热挤压温度为400℃时,合金的抗压强度σbe 和抗压屈服强度σ0.2 分别为610 MPa 和440 MPa;其HV 值达到1 820 MPa,高于采用其它方法制备的Al-Pb 系轴瓦合金的值。

The bearing alloy of Al-15%Pb-4%Si-1%Sn-1.5%Cu (mass%) was prepared by mechanical alloying, subsequently cold compression and hot extrusion. The experimental results show that the Pb and the Al exist in the alloy in the form of nanocrystal and in the form of submicron crystal and amorphous body respectively. The compressive strength and hardness of this alloy were decreased with the increase of extrusion temperature. When hot extruding at 400 degrees C, the compressive strength (sigma(be)) and 0.2% compressive yield stress (sigma(0.2)) of alloys were up to 610 MPa and 440 MPa respectively, and hardness was exceeded 1 820 MPa, which were higher than those of Al-Pb series bearing alloys synthesized by other technique.