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采用热等静压(HIP)技术成形复杂结构的2A12铝合金粉末零件,基于MSC.MARC软件的Shima模型,使用2A12铝合金材料参数实现成形过程的数值模拟。模拟结果表明,特征结构狭缝处粉末体的相对密度呈现梯度分布,侧面的粉末体相对密度分布均匀;石墨模具基本没有变形。实验结果表明,石墨和铝粉末发生了界面反应,型腔内壁存在凹坑和凸起缺陷;粉末试样的规定塑性延伸强度和抗拉强度分别为179 MPa和316 MPa;断口形貌显示试样断裂起源于粉末界面连接处,由金相显微照片分析材料已经完全致密。
2A12 aluminum alloy powder parts with complex structure were formed by hot isostatic pressing (HIP) technology. Based on Shima model of MSC.MARC software, numerical simulation of forming process was carried out by using 2A12 aluminum alloy material parameters. The simulation results show that the relative density of the powder body in the slit of the characteristic structure shows a gradient distribution, and the relative density distribution of the powder body in the side surface is uniform; and the graphite mold has almost no deformation. The experimental results show that the interfacial reaction occurs between graphite and aluminum powder, and the inner wall of the cavity has the defects of dimples and protuberances. The prescribed ductility and tensile strength of the powder sample are 179 MPa and 316 MPa respectively. The fracture morphology shows that the sample Fracture originated in the powder interface junction, metallographic micrographs of the material has been completely densified.