增材制造钛基金字塔点阵结构对镁/钛双金属复合材料界面强化的优化  

Optimization of additive manufactured Ti-based pyramidal lattice structure applied to interface strengthening of Mg/Ti bimetal composites

作　　者：吴远兵 赵建华[1,2] 彭韦力 辜诚 程进 王亚军[1,2] Yuan-bing WU;Jian-hua ZHAO;Wei-li PENG;Cheng GU;Jin CHENG;Ya-jun WANG(College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆大学国家镁合金工程研究中心,重庆400044

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第3期846-860,共15页中国有色金属学报（英文版）

基　　金：supported by Graduate Scientific Research and Innovation Foundation of Chongqing,China (No. CYB21005);the National Natural Science Foundation of China (No. 51875062);China Postdoctoral Science Foundation (No. 2021M700567)。

摘　　要：采用超声辅助固-液复合铸造的方法,通过在界面处采用增材制造的钛基金字塔型点阵材料制备镁/钛异种双金属复合材料。采用正交法对点阵结构参数进行优化。结果表明,优化后的点阵结构参数为:杆直径(d)1 mm,杆长与杆直径比(l/d)3,上节点和下节点直径与杆直径比(d_(1)/d,d_(2)/d)均为2.5,其中l/dd是影响接头失效强度的最显著因素,最优点阵结构参数下镁/钛双金属接头的失效强度为77.3 MPa。实验结果和有限元分析表明:随着点阵结构长径比的增加,镁/钛双金属接头的失效强度先增加后减小,当长径比为3时,失效强度达到最大。Mg/Ti bimetal composites were fabricated by ultrasonic-assisted solid-liquid compound casting with an additively manufactured Ti-based pyramidal lattice structure at the interface.The Taguchi method was carried out to optimize the lattice parameters.The optimized geometric parameters include:the strut diameter(d)is 1 mm,the ratio of strut length to diameter(l/d)is 3,and the ratios of the upper and lower node to diameter(d_(1)/d and d_(2)/d)are 2.5 and 2.5,respectively.The ratio of strut length to diameter is the most significant factor affecting failure strength.The failure strength of the Mg/Ti bimetal joint with the optimized lattice structure is 77.3 MPa.Experimental and simulated results show that the failure strength increases first and then decreases with the increase of l/d,and it reaches the peak value when l/d is 3.

关 键 词：镁/钛双金属复合材料 金字塔点阵结构 优化 增材制造 失效强度 有限元分析 

分 类 号：TB331[一般工业技术—材料科学与工程]