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DOI:
有色金属工程:2020,(10):34-39
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(Ti70.5Fe29.5)100-xYx合金组织和力学性能研究
范馥雅, 刘祥奎, 杨峰, 孔 见
(南京理工大学 材料科学与工程学院 南京)
Study on Microstructure and Mechanical Properties of (Ti70.5Fe29.5)100-xYxAlloys
Fan Fuya, Liu Xiangkui, Yang Feng, Kong Jian
(School of Materials Science and Engineering,Nanjing University of Science and Technology)
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投稿时间:2020-02-22    修订日期:2020-02-24
中文摘要: 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系统的研究。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300 nm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2058 MPa、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2447 MPa,塑性应变量为14.2%。
中文关键词: 钛合金  共晶组织  稀土元素  力学性能
Abstract:The microstructure of(Ti70.5Fe29.5)100-xYx(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 dendritic β-Ti, while the eutectic structure is lamellar TiFe and β-Ti.The thickness of lamellar TiFe phase in Ti70.5Fe29.5 is about 1 μm, while the thickness oflamellar TiFe phase in (Ti70.5Fe29.5)98Y2 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 alloysincrease firstly and then decrease simultaneously with the increase of Y element, but the overall improvement is significant compared with Ti70.5Fe29.5. (Ti70.5Fe29.5)98Y2exhibits a higher compressive strength exceeding 2447 MPa withlarger plastic strain of 14.2%, while Ti70.5Fe29.5exhibits a lower compressive strength of 2058 MPa withlimitedplastic strain of 6.0%.
文章编号:     中图分类号:TG146.23    文献标志码:
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范馥雅,刘祥奎,杨峰,孔 见.(Ti70.5Fe29.5)100-xYx合金组织和力学性能研究[J].有色金属工程,2020,(10):34-39.

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