Effect of energy density on microstructure and mechanical properties of Ta−33Ti alloy prepared via laser powder bed fusion  

能量密度对激光粉末床熔化Ta−33Ti合金显微组织与力学性能的影响

作　　者：Jia-qi ZHANG Chao CHEN Dan LI Zhao-wen GENG Peng PAN Guo-hua WANG Ke-chao ZHOU Jian-ling LIU 张家琪;陈超;李丹;耿赵文;潘鹏;王国华;周科朝;刘渐陵(中南大学粉末冶金国家重点实验室,长沙410083;湖南华翔医疗科技有限公司,宁乡410600)

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]Hunan Huaxiang Medical Technology Co.,Ltd.,Ningxiang 410600,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第12期3919-3934,共16页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52271046);the Natural Science Foundation of Hunan Province,China(No.2022JJ20061);the Fund of State Key Laboratory of Powder Metallurgy,Central South University,China.

摘　　要：The influence of laser process parameters on the densification,phase composition,microstructure,and mechanical properties of Ta−33wt.%Ti alloy prepared via laser powder bed fusion(LPBF)was investigated.The results show that fully dense and homogeneous Ta−Ti parts can be obtained from LPBF with appropriate energy input.The cellular and dendritic structures were formed due to constitutional undercooling.Transmission electron microscopy(TEM)analysis showed that the lamellarα″phase within the cellular structures preferred to concentrate at the cellular boundaries owing to the elemental micro-segregation in the solidification front.The samples fabricated under the energy density of 166.7 J/mm^(3) had a favorable ultimate tensile strength of 806 MPa and an excellent Young’s modulus of 36.7 GPa.研究激光工艺参数对激光粉末床熔化(LPBF)制备的Ta−33%Ti(质量分数)合金的致密化、相组成、显微组织和力学性能的影响。结果表明,在合适的能量输入下,LPBF可以获得完全致密均匀的Ta−Ti零件。由于成分过冷,形成细胞状和树枝状结构。透射电子显微镜(TEM)分析表明,由于凝固前沿元素的微观偏析,细胞状结构中的层状α″相倾向于集中在细胞状结构的边界。在能量密度为166.7 J/mm^(3)的条件下制备的样品具有良好的极限抗拉强度806 MPa和优异的杨氏模量36.7 GPa。

关 键 词：Ta−Ti alloy laser powder bed fusion cellular and dendritic structures constitutional undercooling 

分 类 号：TG146.416[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料]