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通过光学显微镜、X射线衍射和扫描电镜等表征手段,研究流变加工的ADC12合金的显微组织演变和力学性能。结果表明:流变铸造和流变压铸下初生铝树枝晶得到破碎,其平均颗粒尺寸、固相率随浇注温度降低而提高。流变加工有效地提高合金的力学性能。流变铸造条件下,合金抗拉强度随着浇注温度降低而提高,在580到600°C之间浇注可以获得较高的力学性能。流变压铸条件下,595°C浇注可以获得最佳的抗拉强度和伸长率。流变加工对ADC12合金力学性能的提高主要在于实现致密度的提高和初生铝的圆整化。流变铸造和流变压铸工艺下初生铝平均颗粒尺寸与屈服强度可以通过Hall-Petch公式描述。
The microstructure evolution and mechanical properties of rheological processing ADC12 alloy were studied by optical microscopy, X-ray diffraction and scanning electron microscopy. The results show that the primary aluminum dendrites are broken by rheo - casting and rheo - diecasting, and their average particle size and solid fraction increase with the decrease of pouring temperature. Rheological processing effectively improve the mechanical properties of the alloy. The rheological casting conditions, the alloy tensile strength decreases with the pouring temperature increased, pouring between 580 to 600 ° C can get higher mechanical properties. Rheology die-casting conditions, 595 ° C casting can get the best tensile strength and elongation. Rheological processing on the mechanical properties of ADC12 improve mainly due to the realization of the density and primary aluminum roundness. The average particle size and yield strength of primary aluminum under rheo-casting and rheo-diecasting can be described by the Hall-Petch equation.