累积复合轧制对镁合金组织和力学性能的影响

Effect of accumulative roll bonding on microstructures and mechanical properties of MB2 magnesium

采用累积复合轧制技术对MB2镁合金进行轧制。采用光学显微镜、透射电镜和电子拉伸机等设备分析变形前及不同道次后MB2镁合金的微观组织和力学性能。结果表明:MB2镁合金经ARB轧制后,材料平均晶粒尺寸由变形前17.8μm有效细化到1.2μm;材料的抗拉强度和显微硬度值分别提高到300MPa和82.1;伸长率在ARB1道次后从24%下降到11.2%,且随着ARB轧制道次的增加,材料组织的均匀程度提高,抗拉强度和硬度值变化平缓,伸长率回升至22.5%。

MB2 magnesium alloy was deformed by accumulative roll bonding （ARB） technology. The microstructures and mechanical properties of MB2 magnesium alloy after different pass ARB were observed and analyzed by optical microscopy, TEM and tensile testing machine. The results show that the average grain size is refined from 17.8 gm to 1.2um after MB2 magnesium alloy is deformed by ARB process. The tensile strength and microhardness rise to 300 MPa and 82,1, respectively. The elongation rate after ARB 1 decreases from 24% to 11.2%. With the increase of ARB rolling pass, the homogeneous of materials is improved, the tensile strength and hardness change relatively smooth, but the elongation rate rise to 22.5%.