粉末冶金Ti-Fe合金的显微组织及力学性能
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摘要
以元素粉末为原料,采用模压烧结技术制备了Ti-(2-20)Fe合金(Fe分别为2%、5%、10%、15%和20%),探讨了烧结工艺及Fe含量对合金组织和力学性能的影响规律。结果表明,在1100~1300℃烧结温度内可制备出组织成分均匀、高致密度(约为98%)的Ti-Fe合金材料。随Fe元素含量的提高,合金的烧结致密化温度明显降低,制备合金的晶粒尺寸减小,α层片体积含量降低并逐渐细化。当Fe含量为20%时,合金由单一β相晶粒构成。在1150℃烧结制备的Ti-15Fe合金相对具有最优的综合性能,其硬度为43.9 HRC,弹性模量为64.6 GPa,抗压强度为2702 MPa,压缩率为32.7%。
Ti-(2-20) Fe alloys(with 2% 、5% 、10% 、15% or 20% Fe) were fabricated by powder metallurgy technique using elemental powders as raw materials.The effects of sintering temperature and Fe content on microstructure and mechanical properties of the alloys were studied.The results show that the Ti-x Fe alloys with high-density(about 98%) and uniform microstructure can be produced at the sintering temperature range of 1100-1300 ℃.With the increasing of Fe content,the sintering temperature for densification significantly decreases,while the grain size of β phase decreases and the α lamellars become less and thinner.As Fe content is up to 20%,the alloy samples consist of single β grains.In comparison,the Ti-15 Fe alloy sintered at 1150 ℃ exhibits the superior mechanical properties with hardness of 43.9 HRC,elastic modulus of 64.6 GPa,compressive strength of 2702 MPa,and compression rate of 32.7%.
Ti-(2-20) Fe alloys(with 2% 、5% 、10% 、15% or 20% Fe) were fabricated by powder metallurgy technique using elemental powders as raw materials.The effects of sintering temperature and Fe content on microstructure and mechanical properties of the alloys were studied.The results show that the Ti-x Fe alloys with high-density(about 98%) and uniform microstructure can be produced at the sintering temperature range of 1100-1300 ℃.With the increasing of Fe content,the sintering temperature for densification significantly decreases,while the grain size of β phase decreases and the α lamellars become less and thinner.As Fe content is up to 20%,the alloy samples consist of single β grains.In comparison,the Ti-15 Fe alloy sintered at 1150 ℃ exhibits the superior mechanical properties with hardness of 43.9 HRC,elastic modulus of 64.6 GPa,compressive strength of 2702 MPa,and compression rate of 32.7%.
引文
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[6]Niinomi M.Mechanical properties of biomedical titanium alloys[J].Materials Science and Engineering,1998,243:231-236.
[7]Donachie M.Biomedical alloys[J].Advanced Materials&Processes,1998(7):63-65.
[8]Tang H P,Wang J Z,Ao Q B,et al.Effect of pore structure on performance of porous metal fiber materials[J].Rare Metal Materials and Engineering,2015,44(8):1821-1826.
[9]Bai X F,Zhao Y Q,Zeng W D,et al.Deformation mechanism and microstructure evolution of TLM titanium alloy during cold and hot compression[J].Rare Metal Materials and Engineering,2015,44(8):1827-1831.
[10]Wang Y H,Han F B,Kou H C,et al.Internal-atate-variable based constitutive modeling for nearβTi-7Mo-3Al-3Nb-3Cr alloy during hot deformation process[J].Rare Metal Materials and Engineering,2015,44(8):1883-1887.
[11]Majumdar P,Singh S B,Chakraborty M.The role of heat treatment on microstructure and mechanical properties of Ti-13Zr-13Nb alloy for biomedical load bearing applications[J].Journal of the Mechanical Behavior of Biomedical Materials,2011,4(7):1132-1144.
[12]周宇,杨贤金,崔振铎.新型医用β钛合金的研究现状及发展趋势[J].金属热处理,2005,30(1):47-50.ZHOU Yu,YANG Xian-jin,CUI Zhen-duo.Present status and developmental trend of novelβtitaanium alloys for biomedical applications[J].Heat Treatment of Metals,2005,30(1):47-50.
[13]Haghighi S E,Lu H B,Jian G Y,et al.Effect ofα″martensite on the microstructure and mechanical properties of beta-type Ti-Fe-Ta alloys[J].Materials&Design,2015,76:47-54.
[14]Yang Y F,Luo S D,Schaffer G B,et al.The sintering,sintered microstructure and mechanical properties of Ti-Fe-Si alloys[J].Metallurgical and Materials Transactions A,2012,43(12):4896-4906.
[15]Chen B Y,Hwang K S,Ng K L.Effect of cooling process on theαphase formation and mechanical properties of sintered Ti-Fe alloys[J].Materials Science and Engineering A,2011,528(13/14):4556-4563.
[16]金秋,李强,王新宇.粉末冶金法制备Ti-Fe系合金的研究[J].辽宁工业大学学报(自然科学版),2015,35(2):120-123.JIN Qiu,LI Qiang,WANG Xin-yu.Study of Ti-Fe alloy preparation with powder metallurgy method[J].Journal of Liaoning University of Technology(Natural Science Edition),2015,35(2):120-123.
[17]Simka W,Krzakala A,Korotin D M,et al.Modification of a Ti-Mo alloy surface via plasma electrolytic oxidation in a solution containing calcium and phosphorus[J].Electrochimica Acta,2013,96:180-190.