不同热处理工艺对Ti-4Al-6Mo-2V-5Cr-2Zr钛合金微观组织和室温拉伸性能的影响  

Effects of different heat treatment processes on microstructure and room temperature tensile properties of Ti-4Al-6Mo-2V-5Cr-2Zr titanium alloy

作　　者：王圣元 陈立佳[1,2] 车欣[1,2] WANG Shengyuan;CHEN Lijia;CHE Xin(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Shenyang Key Laboratory of Advanced Structural Materials and Applications,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]沈阳工业大学沈阳市先进结构材料与应用重点实验室,沈阳110870

出　　处：《中国体视学与图像分析》2024年第3期194-201,共8页Chinese Journal of Stereology and Image Analysis

基　　金：国家自然科学基金(52104379)

摘　　要：本文以Ti-4Al-6Mo-2V-5Cr-2Zr(wt.%)亚稳β钛合金为研究对象,通过调控微观组织并进行室温拉伸试验,探讨了不同微观组织下合金的力学性能以及相应的变形机制与失效机理。显微组织观察结果表明,锻态合金的微观组织由单一β相构成。合金经β单相区固溶+时效处理后,Ti-4Al-6Mo-2V-5Cr-2Zr合金的微观组织主要由次生α相(αs)和剩余β相组成,呈现为典型的片层结构。经α+β两相区固溶+时效处理后,Ti-4Al-6Mo-2V-5Cr-2Zr合金的微观组织主要由纳米级的α_(s)和微米级的初生α相(α_(p))与晶界α相(GBα)组成,呈现为典型的分层纳米结构。锻态合金具有最低的抗拉强度(Ultimate Tensile Strength,UTS)和最高的伸长率(Elongation,E1),分别为807MPa和23%。片层结构的Ti-4Al-6Mo-2V-5Cr-2Zr合金具有最高的抗拉强度和最低的伸长率,分别为1235 MPa和10.5%。This paper focuses on understanding the mechanical properties,deformation,and failure mechanisms of Ti-4Al-6Mo-2V-5Cr-2Zr(wt.%)metastableβtitanium alloy under different microstructures,through tensile tests at room temperature.Results of microstructural characterization show that the microstructure of the forged alloy consists of a singleβ-phase.After a solution plus aging treatment in theβphase region,the microstructure of Ti-4A1-6Mo-2V-5Cr-2Zr alloy mainly consists of secondaryα-phase(αs)and residualβ-phase,presenting a typical lamellar structure.After a solution plus aging treatment in theα+βphase region,the microstructure of Ti-4A1-6Mo-2V-5Cr-2Zr alloy mainly consists of nanoscale as and microscale primaryα-phase(αp)and grain boundaryα(GBα),forming a typical layered nanostructure.The forged alloy has the lowest ultimate tensile strength(UTS)and the highest elongation(El)of 807 MPa and 23%,respectively.The lamellar-structured Ti-4Al-6Mo-2V-5Cr-2Zr alloy has the highest UTS and lowest El of 1235 MPa and 10.5%,respectively.

关 键 词：Β钛合金 固溶处理 时效处理 显微组织 拉伸性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]