选区激光熔化TiC/AlMgSc复合材料组织及性能研究
Microstructure and Properties of TiC/AlMgSc Composites by Selective Laser Melting
丁惟云 1司福贵 2夏长庚 2孙德志 2徐亚坤 2徐英翠 2程浩杰 2王孟志 2季伟2
作者信息
- 1. 中国重型汽车集团有限公司,山东 济南 250101
- 2. 中国重型汽车集团有限公司汽车研究总院,山东 济南 250101
- 折叠
摘要
基于选区激光熔化(SLM)成形工艺制备了亚μm TiC颗粒增强AlMgSc复合材料,研究了TiC/AlMgSc复合材料的物相组成、显微组织和力学性能.研究结果表明:采用优化后的SLM成形工艺参数获得了高致密度(99.73%)的TiC/AlMgSc复合材料;SLM成形中TiC颗粒与AlMgSc基体之间没有发生反应,TiC颗粒提供了高密度的有效形核点,促使复合材料组织向等轴晶转变,晶粒发生细化,并且减弱了织构强度;添加TiC颗粒后,复合材料抗拉强度提升了9.9%,达到了 611 MPa,延伸率下降为 10.02%;材料的断裂机制主要为韧脆混合断裂,在断口表面处留存着尺寸为 3～8 μm的TiC团簇颗粒,并黏附在铝基体中.
Abstract
TiC nanoparticles reinforced AlMgSc composites are prepared based on selective laser melting(SLM)forming process,and the phase composition,microstructure and mechanical properties of TiC/AlMgSc composites are studied.The results show that TiC/AlMgSc composites with high density(99.73%)are obtained by using the optimized SLM forming process parameters.There is no reaction between TiC particles and AlMgSc matrix during SLM forming.TiC particles provide high-density effective nucleation points,which promote the transformation of the composite structure to equiaxed grains and grain refinement,and weaken the texture strength.After adding TiC particles,the tensile strength of the composites increased by 9.9%to 611 MPa,and the elongation decreased to 10.02%.The fracture mechanism of the composites is mainly ductile and brittle mixed fracture,and TiC clusters with a size of 3‒8 μm remain on the fracture surface and adhere to the aluminum matrix.
关键词
激光技术/选区激光熔化/铝基复合材料/微观组织/拉伸性能Key words
laser technology/selective laser melting/aluminum matrix composite/microstructure/tensile properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据