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通过金相显微镜、万能拉伸试验机、布氏硬度计、扫描电镜,研究了低温预时效对ZM6镁合金组织和性能的影响。结果显示,随着预时效温度的升高,ZM6镁合金光学显微组织没有明显变化,平均晶粒尺寸在39.88~41.67μm之间;合金的布氏硬度和抗拉强度整体上呈现先增加后下降的趋势。ZM6镁合金在100℃×4h+200℃×8h的双级时效后,综合力学性能最佳,其中硬度HBS为80.7,抗拉强度为260 MPa。合金断口比较平坦,断裂方式多为沿晶断裂并伴随有部分穿晶断裂,以解理断裂为主。
The effects of pre-aging at low temperature on microstructure and properties of ZM6 magnesium alloy were studied by metallographic microscope, universal tensile tester, Brinell hardness tester and scanning electron microscope. The results show that with the increase of pre-aging temperature, the optical microstructure of ZM6 magnesium alloy does not change obviously, and the average grain size is between 39.88 and 41.67μm. The Brinell hardness and tensile strength of the alloy firstly increase Downward trend. ZM6 magnesium alloy at 100 ℃ × 4h +200 ℃ × 8h after two-stage aging, the best mechanical properties, including hardness HBS 80.7, tensile strength of 260 MPa. The fracture of the alloy is relatively flat. Most of the fracture modes are intergranular fracture accompanied by partial transgranular fracture, mainly cleavage and fracture.