激光增材制造(Ti+B4C)/AA7075复合粉末工艺与组织性能研究
Microstructure and Properties of(Ti+B4C)/AA7075 Composite Powder by Laser Melting Deposition
王俊豪 1赵吉宾 2贺晨 2赵宇辉 2李播博1
作者信息
- 1. 沈阳航空航天大学机电工程学院,辽宁沈阳 110135
- 2. 中国科学院沈阳自动化研究所,辽宁沈阳 110169
- 折叠
摘要
通过高能球磨法制备了加入5％(质量分数)的球形纯钛粉和不同含量B4C陶瓷颗粒(3％、5％、10％,质量分数)的(Ti+B4C)/AA7075复合粉末,采用激光熔化沉积技术(laser melting deposition,LMD)制备了多组增材试样,研究了钛元素以及不同质量分数B4C陶瓷粉末对复合材料显微组织和力学性能的影响规律.结果表明:同时添加球形纯钛粉以及B4C陶瓷颗粒可以有效地解决AA7075铝合金在LMD成型过程中出现的气孔与开裂问题.当B4C的质量分数为3％时,复合材料的平均显微硬度(HV0.2)以及抗拉强度分别为1388.17 MPa和336.93 MPa,比沉积态AA7075铝合金的980.69和200.05 MPa分别提高了 41.6％和68.4％.之后,随着B4C质量分数由3％增加到10％,试样的抗拉强度逐渐降低,但耐磨性能逐渐增强,平均摩擦系数由0.83降到0.78,磨损形式由黏着磨损转变为剥层磨损.
Abstract
The(Ti+B4C)/AA7075 composite powder with 5wt％spherical pure titanium powder and B4C ceramic particles(3wt％,5wt％,10wt％)was prepared by high-energy ball grinding,and several groups of additive samples were prepared by laser melting deposition(LMD)technology.The influence of titanium element and ceramic powder with different B4C contents on the mechanical properties of the composites was studied.The results show that the addition of spherical pure titanium powder and B4C ceramic particles can effectively overcomes the pores and cracking of AA7075 aluminum alloy during LMD molding process.When the mass fraction of B4C is 3wt％,the average microhardness(HV0.2)and tensile strength of the composites are 1388.17 MPa and 336.93 MPa,respectively,which are 41.6％and 68.4％higher than 980.69 MPa and 200.05 MPa of the deposited AA7075 aluminum alloy.Later,with the increase in B4C mass fraction from 3wt％to 10wt％,the tensile strength of the sample gradually decreases,but the wear resistance gradually increases,the average friction coefficient decreases from 0.83 to 0.78,and the wear form changes from adhesive wear to peeling wear.
关键词
AA7075铝合金/颗粒增强/激光熔化沉积/微观组织/力学性能Key words
AA7075 aluminum alloy/particle enhancement/laser melting deposition/microstructure/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据