(Ti70.5Fe29.5)100-xYx合金组织和力学性能研究  

Study on Microstructure and Mechanical Properties of(Ti 70.5 Fe 29.5)100-x Y x Alloys

作　　者：范馥雅 刘祥奎 杨峰 孔见[1] FAN Fuya;LIU Xiangkui;YANG Feng;KONG Jian(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,南京210094

出　　处：《有色金属工程》2020年第10期34-39,共6页Nonferrous Metals Engineering

摘　　要：对(Ti70.5Fe29.5)100-xYx(x=0,1,2,3,4)合金的组织和力学性能进行了研究。结果表明:Ti-Fe-Y系三元合金组织呈现出亚共晶特征,即包括先析出枝晶状β-Ti和片层状(TiFe+β-Ti)共晶组织。其中Ti70.5Fe29.5片层状TiFe相厚度约为1μm,而(Ti70.5Fe29.5)98Y2片层状TiFe相厚度仅300nm左右,组织得到了大幅度细化。Ti-Fe-Y系合金的强度和塑性由于组织细化程度的不同,随着Y元素含量的增加,同向呈现出先上升后下降的趋势,但较Ti70.5Fe29.5而言均得到了较大幅度的提升。对比Ti70.5Fe29.5的抗压强度2058MPa、塑性应变量为6.0%,(Ti70.5Fe29.5)98Y2的综合力学性能最佳,其抗压强度为2447MPa,塑性应变量为14.2%。The microstructure of(Ti 70.5 Fe 29.5)100-x Y x(x=0,1,2,3,4)alloys were analyzed and the mechanical properties were tested.The results show that the microstructure of Ti-Fe-Y alloys exhibit hypoeutectic characteristics.The first precipitated phase is dendriticβ-Ti,while the eutectic structure is lamellar TiFe andβ-Ti.The thickness of lamellar TiFe phase in Ti 70.5 Fe 29.5 is about 1μm,while the thickness of lamellar TiFe phase in(Ti 70.5 Fe 29.5)98 Y 2 is only about 300 nm,the microstructure has undergone substantial refinement.Due to the different extent of refinement,the compressive strength and plasticity of Ti-Fe-Y alloys increase firstly and then decrease simultaneously with the increase of Y element,but the overall improvement is significant compared with Ti 70.5 Fe 29.5,(Ti 70.5 Fe 29.5)98 Y 2 exhibits a higher compressive strength exceeding 2447 MPa with larger plastic strain of 14.2%,while Ti 70.5 Fe 29.5 exhibits a lower compressive strength of 2058 MPa with limited plastic strain of 6.0%.

关 键 词：钛合金 共晶组织 稀土元素 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]