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采用熔体直接反应法,原位制备5%Al_3Zr/6063Al质量分数复合材料。在450℃进行70%变形量锻造预处理,然后进行搅拌摩擦大塑性加工,通过XRD、SEM、EDS、超景深及TEM等分析测试方法研究其高应变速率超塑性。结果表明,通过锻造和搅拌摩擦加工处理后,复合材料的平均晶粒尺寸小于10μm。在350~500℃,初始应变速率为1.0×10~(-3)~1.0×10~(-1)s~(-1)范围内,复合材料均呈现超塑性。在500℃,初始应变速率为1.0×10~(-2)s~(-1),延伸率达到最大值330%,反应敏感指数m值为0.45。分析超塑性变形的主要机制是动态连续再结晶与晶界、位错滑移共同协调完成。
The melt direct reaction method was used to prepare in-situ 5% Al_3Zr / 6063Al mass fraction composite. The preforming was carried out at 450 ℃ for 70% deformation forging pretreatment, and then the friction plastic processing was carried out. The high strain rate superplasticity was studied by XRD, SEM, EDS, TEM and TEM. The results show that the average grain size of the composite is less than 10μm after the forging and the friction stir processing. The composites showed superplasticity at 350-500 ℃ and initial strain rate of 1.0 × 10 -3 ~ 1.0 × 10 -1 s -1. At 500 ℃, the initial strain rate was 1.0 × 10 -2 s -1, the elongation reached the maximum of 330%, and the value of m was 0.45. The main mechanism of the analysis of superplastic deformation is dynamic continuous recrystallization and grain boundaries, dislocation slip coordination to complete.