孔洞缺陷对铝硅合金压铸件强度的影响分析  

Study of the Effect of Void Defects on the Strength of Diecast Aluminium-silicon Alloys

作　　者：高亮 王雪强 陈浩铭 秦永瑞 兰乔 王鑫 付彭怀[3] 彭立明[3] GAO Liang;WANG Xueqiang;CHEN Haoming;QIN Yongrui;LAN Qiao;WANG Xin;FU Penghuai;PENG Liming(Chongqing Changan Automobile Co.,Ltd.,Chongqing 400023,China;School of Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]重庆长安汽车股份有限公司,重庆400023 [2]上海交通大学船舶海洋与建筑工程学院,上海200240 [3]上海交通大学材料科学与工程学院,上海200240

出　　处：《铸造工程》2025年第2期1-6,共6页Foundry Engineering

基　　金：国家自然科学基金资助项目(U2102212)。

摘　　要：为了定量评估孔洞缺陷对材料强度的影响,选取了一种新型免热处理的JDA1b合金作为研究对象,并设计了具有不同厚度与流动长度的高压压铸模具。通过开展压铸实验、拉伸测试以及铸造过程模拟研究,探讨了试样厚度及孔洞缺陷率对JDA1b合金力学性能的影响规律。研究结果表明,随着孔洞缺陷率的增加,该合金铸件的屈服强度、抗拉强度以及伸长率出现不同程度的下降。基于此,进一步提出了一个综合考虑缺陷率与材料厚度系数的力学本构模型,该模型能够有效反映孔洞缺陷及铸件壁厚变化对于铝硅合金压铸件力学性能所产生的弱化效应。To quantitatively assess the effect of void defects on the strength of the material,this study selected heat-treatmentfree JDA1b alloy as the research object and designed a high-pressure die-casting mould with different thicknesses and flow lengths.The effects of specimen thickness and void defect rate on the mechanical properties of JDA1b alloy were investigated by die-casting tests,tensile tests and casting process simulation.Results show that the yield strength,tensile strength and elongation of the alloy decrease to different degrees with the growth of the void defect rate.Based on this,a constitutive model that integrates the defect rate and the material thickness coefficient is proposed.The model can capture the weakening effect of hole defects and wall thickness changes on the mechanical properties of die-cast aluminium-silicon alloys.

关 键 词：压铸 铝硅合金 孔洞缺陷 强度 本构模型 

分 类 号：TG249.2[金属学及工艺—铸造]