摘要
搅拌摩擦增材制造作为一种新型固相增材制造技术,能够有效避免高强铝锂合金元素烧损的同时获得高性能增材构件。本文提出自限位搅拌摩擦增材制造方法,以铝锂合金带材为原料制备多层增材结构件。结果表明,搅拌摩擦增材区内材料流动充分,层间冶金结合良好。增材层晶粒尺寸和沉淀相分布主要受热–机械效应影响,搅拌道次越少的区域,热机效应小,沉淀相越多,硬度越高。单层增材厚度1 mm,增材速率达200 mm/min,增材区硬度最高为126.8HV,达到2195–T8铝锂合金的79.3%。同时,由于部分Cu元素固溶于增材区,搅拌摩擦固相增材区的耐腐蚀性能优于母材。
Friction stir additive manufacturing(FSAM)as a novel solid-state additive manufacturing technology,can be effectively utilized to fabricate high-performance components without evaporating the elements of aluminum–lithium alloy.Self-constrained friction stir additive manufacturing was proposed to prepare the multi-layered structural components made of aluminum–lithium alloy strips.The results show that the well interlayer metallurgical bonding was obtained due to the sufficient material flow.The grain sizes and distribution of the precipitates in each additive manufactured layer were primarily influenced by thermal-mechanical effects.Those layers worked by less stirring pass showed more precipitates and higher microhardness,attributed to less thermal-mechanical effects.The additive manufacturing thickness of single layer is 1 mm,and the additive manufacturing rate is 200 mm/min.The microhardness reached 126.8HV(79.3%of 2195–T8 aluminum-lithium alloy).The corrosion resistance of the additive manufacturing zone was better than that of the base materials due to the solid solution of Cu elements.
作者
孟祥晨
马潇天
常月鑫
赵耀邦
陈思浩
陈会子
万龙
黄永宪
MENG Xiangchen;MA Xiaotian;CHANG Yuexin;ZHAO Yaobang;CHEN Sihao;CHEN Huizi;WAN Long;HUANG Yongxian(State Key Laboratory of Modern Welding Production Technology,Harbin Institute of Technology,Harbin 150001,China;Zhengzhou Research Institute,Harbin Institute of Technology,Zhengzhou 450046,China;Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第10期60-65,共6页
Aeronautical Manufacturing Technology
基金
中国航天科技集团公司第八研究院产学研合作基金(SAST2020–108)
国家自然科学基金(52175301)。
关键词
搅拌摩擦增材制造(FSAM)
铝锂合金
微观组织
显微硬度
耐腐蚀性
Friction stir additive manufacturing(FSAM)
Aluminum–lithium alloy
Microstructures
Microhardness
Corrosion resistance
