W替代部分Mo对Ti-Al-Mn-Mo合金耐磨及拉伸性能的影响  

Effect of W Replacing Part of Mo on Wear Resistance and Tensile Property of Ti-Al-Mn-Mo Alloy

作　　者：杨心月 李小兵 薛鹏 陈波 舒磊 牛红志 刘奎 Yang Xinyue;Li Xiaobing;Xue Peng;Chen Bo;Shu Lei;Niu Hongzhi;Liu Kui(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Materials Science and Technology Research Department,Ji Hua Laboratory,Foshan 528200,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]季华实验室材料科学与技术研究部,广东佛山528200

出　　处：《稀有金属材料与工程》2025年第1期118-125,共8页Rare Metal Materials and Engineering

基　　金：季华实验室科研项目(X210291TL210);国家自然科学基金(51971215)。

摘　　要：对比测试了2种低成本、易变形的Ti-44Al-3Mn-0.8Mo(TMM)和Ti-44Al-3Mn-0.4Mo-0.4W(TMMW)合金(原子分数,%,下同)的耐磨性能和拉伸性能,分析了用0.4Mo-0.4W替代0.8Mo后对其耐磨性、显微硬度、拉伸性能以及显微组织特征的影响。结果表明,W替代部分Mo使Ti-Al-Mn-Mo系合金的耐磨性能与显微硬度得到明显改善,且合金室温和高温拉伸强度有所提高,室温延伸率由0.75%提高至1.50%,高温延伸率稍有降低。对比发现,合金中W的β稳定作用要稍弱于Mo,W的替代使得合金组织中残存的β_o相和γ相含量降低,α_(2)相含量明显增加,片层组织含量提高,片层间距减小。TMMW合金具有更高的显微硬度和更佳的耐磨性与W替代后合金组织、相构成变化有密切关系。W替代部分Mo后合金β_o相含量减少、片层含量的提高及片层厚度的降低是合金具有更高拉伸强度和更优室温延伸率的主要原因。The wear resistance and tensile property of two low-cost,easy-to-deform Ti-44Al-3Mn-0.8Mo(TMM)and Ti-44Al-3Mn-0.4Mo-0.4W(TMMW)alloys(atomic fraction,%,the same below)were comparatively tested.The effects of replacing 0.8 Mo with 0.4Mo-0.4W on their wear resistance,microhardness,tensile property and microstructure were analyzed.The results show that replacing part of Mo with W can obviously improve the wear resistance and microhardness of Ti-Al-Mn-Mo alloy,and also increase the tensile strength of the alloy at room temperature and high temperature.The room temperature elongation is increased from 0.75%to 1.50%,while the high temperature elongation is slightly reduced.It is found that theβ-stabilizing effect of W in the alloys is slightly weaker than that of Mo,and the replacement of W reduces the content ofβ_o phase andγphase remaining in the structure,increases the content ofα_(2) phase obviously,increases the content of lamellar structure,and decreases the lamellar spacing.The higher microhardness and better wear resistance of TMMW alloy are closely related to the changes of microstructure and phase composition.The decrease inβ_o phase content,the increase in lamellar content and the decrease in lamellar thickness are the main reasons for the higher tensile strength and better room temperature elongation of the alloy after W replaces part of Mo.

关 键 词：β凝固γ-TiAl合金 耐磨性能 拉伸性能 显微组织 W和Mo 

分 类 号：TG146.23[一般工业技术—材料科学与工程]