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通过金相、宏观织构、力学性能和埃里克森杯突试验研究了经450℃热轧并在350℃退火1 h的Mg-1.5Zn-0.2Ce合金板材的微观组织及成形性能。结果表明:轧制变形能够大大细化晶粒,随着总变形量从80%增加到90%,平均晶粒尺寸由38μm减小到16μm,轧向(RD)、斜向(45°)、横向(TD)三个方向的抗拉强度和屈服强度增大,基面织构强度最大值由2.46减小到2.05,r值由0.96减小到0.8,平面各项异性系数Δr由0.19减小到0.01,埃里克森杯突值由5.14增加到5.46。在相同的热处理条件下,总热轧变形量为90%的Mg-1.5Zn-0.2Ce合金板材具有更为优异的成形性能。试验结果同时也表明,在Mg-1.5Zn中添加0.2%的Ce元素后,IE值由2.60增加至5.46。
The microstructure and formability of Mg-1.5Zn-0.2Ce alloy sheet hot-rolled at 450 ℃ and annealed at 350 ℃ for 1 h were studied by means of metallography, macro-texture, mechanical properties and Erickson test. The results show that the grain size can be greatly refined by rolling deformation. The average grain size decreases from 38μm to 16μm with the total deformation from 80% to 90%. The rolling direction (RD), oblique direction (45 °) The tensile strength and yield strength in the transverse direction (TD) increased, the maximum value of texture strength decreased from 2.46 to 2.05, r value decreased from 0.96 to 0.8, and the anisotropy coefficient Δr decreased from 0.19 To 0.01, Erickson Cup sudden increase from 5.14 to 5.46. Under the same heat treatment conditions, Mg-1.5Zn-0.2Ce alloy sheet with total hot rolling deformation of 90% has more excellent formability. The test results also show that, after adding 0.2% Ce element in Mg-1.5Zn, the IE value increased from 2.60 to 5.46.