摘要
以球磨TiB_(2)和Ti-6Al-4V混合粉末为原料,采用选区激光熔化(SLM)技术制备了增强相为TiB的钛基复合材料,分析了B元素含量对SLM成形钛基复合材料显微组织和力学性能的影响。研究结果表明:在SLM过程中,TiB_(2)与Ti元素发生反应生成针状TiB增强相,B元素含量较高的试样中出现了针状增强相聚集的现象;由于B元素的存在,钛基复合材料中的α相明显细化;相比于传统的Ti-6Al-4V合金,TiB/Ti-6Al-4V复合材料的显微硬度、抗拉强度以及屈服强度均有明显改善。钛基复合材料优异的力学性能归因于TiB增强相的硬化、强化效应以及基体的晶粒细化。当B元素的质量分数为0.5%时,α片层的平均尺寸为0.49μm,钛基复合材料的抗拉强度和屈服强度相比于Ti-6Al-4V分别提高了25.7%和30.8%,抗拉强度为1396.4 MPa,屈服强度为1322.2 MPa。
Objective With the rapid development of China’s aerospace industry,particularly considering the implementation of a series of national programs such as"Project Moonshot"and the"Large Aircraft Program",the standards for the strength,modulus,wear resistance,and temperature resistance of materials are increasingly high.Ti and its alloys are widely used in the aerospace,biomedical,and chemical industries because of their high specific strength,excellent corrosion resistance,good heat resistance,and high biocompatibility.However,the poor friction performance and low hardness of Ti alloys limit their application in some fields.Particle-reinforced titanium matrix composites(TMCs)can maintain the excellent properties of Ti alloys.These composites have a higher specific strength and specific modulus than Ti alloys;thus,they are expected to become essential structural metal materials in the aerospace industry.In recent years,TMCs have attracted significant interest from researchers in the field of materials.TiB is a ceramic reinforcement with high hardness,and its melting point is as high as 20000 C;moreover,there is a very small density difference between TiB and Ti.TiB particles can be produced by an in-situ reaction between Ti and TiB_(2),which leads to the formation of good interfacial bonding between the matrix and the TiB reinforcement.Recently,selective laser melting(SLM),as a newly developed additive manufacturing technology,has attracted extensive attention because it can directly process powder into materials with complex shapes and high precision.At present,the researches on the formation of TiB-reinforced TMCs via SLM mainly focus on the microstructure,distribution of the reinforcement phase,and microhardness;however,there are a few studies focusing on the mechanical properties of these materials,such as the tensile strength and plasticity.Therefore,analyzing the microstructure,phase composition,and mechanical properties of TiB-reinforced TMCs formed by SLM is necessary.Methods TiB_(2)/Ti-6 Al-4 V mixed powde
作者
钦兰云
门继华
赵朔
杨光
王伟
王向明
Qin Lanyun;Men Jihua;Zhao Shuo;Yang Guang;Wang Wei;Wang Xiangming(Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang,Liaoning 110136,China;Shenyang Aircraft Design Institute,China Aviation Industry Group Corporation,Shenyang,Liaoning 110035,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2021年第6期49-58,共10页
Chinese Journal of Lasers
基金
国家重点研发计划(2016YFB1100504)
总装重点基金(61409230311)
国家自然科学基金(51975387)
沈阳航空航天大学航空制造工艺数字化国防重点学科实验室开放基金(SHSYS2017003)。
