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通过XRD、压缩试验等方法研究了不同离心压力对AZ31镁合金组织演变和力学性能的影响。结果表明,随着离心压力的增大,离心铸造AZ31镁合金的晶粒明显细化,平衡凝固的共晶转变被抑制,第二相β-Mg17Al12析出量减少,由粗大的“骨骼”状分布转变成弥散分布在晶界,形成以过饱和初生相α-Mg为主相的凝固组织。XRD分析表明,离心压力的增大引起X射线衍射峰向高角度方向偏移,α-Mg的晶格常数减小。随着离心压力的增大,合金力学性能得到明显改善,抗压强度从199 MPa提高到256 MPa,而伸长率变化不明显。
The effects of different centrifugal pressures on the microstructure evolution and mechanical properties of AZ31 magnesium alloy were studied by XRD and compression tests. The results show that with the increase of centrifugal pressure, the grain size of centrifugal casting AZ31 magnesium alloy is obviously refined, the eutectic transformation of equilibrium solidification is inhibited, the amount of precipitated β-Mg17Al12 of the second phase decreases, Like distribution into a dispersed distribution in the grain boundary, the formation of a supersaturated primary phase α-Mg as the main phase of the solidified structure. XRD analysis showed that the increase of centrifugal pressure caused the X-ray diffraction peak shifted to a high angle, and the lattice constant of α-Mg decreased. With the increase of centrifugal pressure, the mechanical properties of the alloy have been significantly improved, compressive strength increased from 199 MPa to 256 MPa, while the elongation changes insignificantly.