Effect of rare earth element Er on microstructure and properties of Ti-6Al-4V-0.5Si alloy

doi:10.13251/j.issn.0254-6051.2020.12.043

Abstract

Abstract: Ti-6Al-4V-0.5Si-xEr (wt%) alloy was prepared by powder metallurgy process, and the effect of Er content on the microstructure and properties of the alloys solution-treated+aged (950 ℃×30 min (WQ)+480 ℃×4 h (AQ)) was studied by means of OM, XRD, TEM and tensile testing machine. The results show that the tested alloys are all duplex microstructure with equiaxed and lamellar feature after solution and aging treatment. The Er₂O₃ particles produced in the sintering process can be used as nucleation core to promote the precipitation of α and β phases and play a role in grain refinement. With the increase of Er content, the grain size is refined from 10-20 μm to 5-10 μm. When the Er content is 1.2%, the tensile strength of the tested alloy reaches the peak of 930.5 MPa, and the corresponding elongation is 9.24%, which are 22.3% and 10.0% respectively higher than that of Ti-6Al-4V-0.5Si alloy with no Er addition. The tensile fracture morphologies of the tested alloy show dimples, with only a small amount of cleavage steps. The existence of dimples can disperse the stress generated during the fracture of the material and makes the material withstand greater deformation before fracture.

Key words: titanium alloy, misfit, grain refining, tensile strength, elongation

CLC Number:

TG156

Liu Chao, Liu Guowei, Guo Leiming, Yang Jigang, Liu Kedi, Wang Zhaozhao. Effect of rare earth element Er on microstructure and properties of Ti-6Al-4V-0.5Si alloy[J]. Heat Treatment of Metals, 2020, 45(12): 222-226.

References

[1] Guo W, Sun M, Qiu R, et al.Research progress on corrosion and aging of materials in deep-sea environment[J]. Corrosion Science and Protection Technology, 2017, 24(8): 125-135.
[2] 王科. 钛合金制备方法的研究进展[J]. 材料导报, 2014, 28(2): 143-146.
Wang Ke.Progress in manufacture of titanium alloy[J]. Materials Review, 2014, 28(2): 143-146.
[3] 韩鹏. 铒对高温钛合金组织和性能的影响[D]. 北京: 北京工业大学, 2012.
Han Peng.Influence of erbium on microstructure and properties of high temperature titanium alloy[D]. Beijing: Beijing University of Technology, 2012.
[4] Ertuan Z, Yuyong C, Fantao K, et al.Effect of yttrium on microstructure and mold filling capacity of a near-α high temperature titanium alloy[J]. China Foundry, 2012, 9(4): 344-348.
[5] 陈慧琴, 曹春晓. 等轴组织α-β钛合金热变形微观组织的表征[J]. 中国有色金属学报, 2012, 22(3): 22-30.
Chen Huiqin, Cao Chunxiao.Characterization of hot deformation microstructures of α-β titanium alloy with equiaxed structure[J]. Transactions of Nonferrous Metals Society of China, 2012, 22(3): 22-30.
[6] 张豪胤, 王文焱, 祝要民, 等. 固溶、时效对TC4钛合金组织和力学性能的影响[J]. 特种铸造及有色合金, 2014, 34(6): 659-661.
Zhang Haoyin, Wang Wenyan, Zhu Yaomin, et al.Effects of solution aging on microstructure and mechanical properties of TC4 alloy[J]. Special-cast and Non-ferrous Alloys, 2014, 34(6): 659-661.
[7] Huang C, Song B, Mao J, et al.The mathematical model of wetting angle of heterogeneous nucleation[J]. Science in China, 2004, 47(4): 391-397.
[8] 王斌. 稀土添加对粉末冶金钛合金组织与性能影响研究[D]. 长沙: 中南大学, 2011.
Wang Bin.Effect of rare earth elements on the microstructures and properties of powder metallurgical titanium alloys[D]. Changsha: Central South University, 2011.
[9] 刘延斌, 刘咏, 谌炎辉, 等. 稀土元素La对粉末冶金钛合金锻态组织与力学性能的影响[J]. 粉末冶金材料科学与工程, 2014(2): 223-229.
Liu Yanbin, Liu Yong, Chen Yanhui, et al.Effect of rare earth-La on microstructure and mechanical property of Powder forged Ti alloys[J]. Materials Science and Engineering of Powder Metallurgy, 2014(2): 223-229.
[10] Patil S, Kekade S, Phapale K, et al.Effect of α and β phase volume fraction on machining characteristics of titanium alloy Ti6Al4V[J]. Procedia Manufacturing, 2016, 6: 63-70.
[11] Nieh T G, Wadsworth J.Hall-Petch relation in nanocrystalline solids[J]. Scripta Metallurgica Et Materialia, 1991, 25(4): 955-958.

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