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B_(4)C陶瓷颗粒(3%、5%、10%,质量分数)的(Ti+B_(4)C)/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B_(4)C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B_(4)C的质量分数为3%时,复合材料的平均显微硬度(HV_(0.2))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。
The(Ti+B_(4)C)/AA7075 composite powder with 5wt%spherical pure titanium powder and B_(4)C ceramic particles(3wt%,5wt%,10wt%)was prepared by high-energy ball grinding,and several groups of additive samples were prepared by laser melting depositio n(LMD)technology.The influence of titanium element and ceramic powder with different B_(4)C 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 B_(4)C is 3wt%,the average microhardness(HV_(0.2))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 B_(4)C 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.
作者
王俊豪
赵吉宾
贺晨
赵宇辉
李播博
Wang Junhao;Zhao Jibin;He Chen;Zhao Yuhui;Li Bobo(School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110135,China;Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110169,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第12期3485-3492,共8页
Rare Metal Materials and Engineering
基金
国家重点研发计划(2022YFB4602203)
辽宁省博士科研启动基金计划(2022-BS-026)
内蒙古自治区重点研发和成果转化计划(2023KJHZ0029)
国家自然科学基金(52105386)
沈阳市中青年科技创新人才支持计划(RC220527)。
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
AA7075 aluminum alloy
particle enhancement
laser melting deposition
microstructure
mechanical property
