华东交通大学学报2023，Vol.40Issue(6)：79-85,7.
Ti5Si3含量对SiCp/2009Al激光填粉焊接头组织性能的影响
Effect of Ti5Si3 Content in Filler Powder on the Microstructure and Properties of SiCp/2009Al Laser Filler Welding Joint
摘要
Abstract
SiC particle reinforced aluminum matrix composites have broad application prospects in the field of rail transit.However,this material is prone to brittle phases that affect the quality of joints during the melting welding process,which restricts the development of SiC particle reinforced aluminum matrix composites.Ti and Si element compensation is applied to suppress the brittle phase of Al4C3 and laser powder welding of SiCp/2009Al composite materials.Ti and Si element compensation is used to suppress the brittle phase of Al4C3,and laser powder welding is conducted on SiCp/2009Al composite materials.SEM and XRD are used to analyze the microstructure of the welded joint.The hardness and tensile properties of the joint are tested using a vickers hardness tester and a universal testing machine,respectively,in order to analyze the influence of Ti5Si3 content on the microstructure and mechanical properties of the joint.The results indicate that the addition of Ti5Si3 has a significant effect on inhibiting the decomposition of SiC particles and the formation of Al4C3 brittle phase through their reaction with Al,but the Al4C3 brittle phase is not found in the weld seam;with the increase of Ti5Si3 con-tent,the distribution density and size of Al3Ti in the weld microstructure first decrease and then increase,the morphological integrity of the fusion zone first increases and then decreases,and the width of the heat-affected zone first decreases and then increases;with the increase of Ti5Si3 content,and the tensile strength of the joint shows a trend of first increasing and then decreasing,the tensile strength of the welded joint with 20%Ti5Si3 powder added is 2.8 times that of the welded joint with 50%Ti5Si3 powder added.关键词
激光填粉焊接/铝基复合材料/脆性相/力学性能Key words
laser powder filling welding/Al-MMC/brittle phase,mechanical property分类
矿业与冶金引用本文复制引用
赵明娟,程梓威,赵龙志,刘德佳,焦海涛,唐延川,余梦..Ti5Si3含量对SiCp/2009Al激光填粉焊接头组织性能的影响[J].华东交通大学学报,2023,40(6):79-85,7.基金项目
国家自然科学基金项目(51965022) （51965022）
