纯钼高压扭转过程中微纳尺度的力学性能
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摘要
对工业烧结纯钼在室温下进行了压力为6GPa,扭转圈数为1、2和5圈的高压扭转实验,借助纳米压痕测试技术对变形前后试样进行了力学性能表征,通过有限元模拟获得了不同变形程度试样的应力-应变曲线。结果表明:高压扭转对纯钼力学性能具有显著的强化作用,变形前后试样的纳米硬度和屈服强度分别从3.02 GPa和970 MPa升高至7.80 GPa和3370 MPa。分析认为,细晶强化和位错强化是强度提升的主要因素。然而,高压扭转变形导致的位错增殖和残余应力升高使材料的弹性模量随应变量的增大而逐步降低。此外,基于有限元模拟所得的应力-应变曲线,建立了高压扭转过程中应力和等效应变之间的关系,讨论了大塑性变形过程中的硬化行为。
Pure molybdenum material was processed by high-pressure torsion(HPT) at room temperature under the applied pressure of 6 GPa with different revolution number of 1, 2 and 5 turns, and the ultrafine-grained molybdenum was obtained. Nanoidentation technology was applied to characterize the mechanical properties of HPT-processed samples as well as the sintered one. The load-displacement curves,hardness and elastic modulus were obtained directly. The stress-strain curves of different samples were obtained based on the finite element simulation by using the software of Abaqus. The results show that the hardness of HPT-processed samples has an obvious increase from3.02 GPa to 7.80 GPa. Correspondingly, the yield strength increases significantly from 970 MPa to 3370 MPa. Grain refinement and dislocation tangling make the major contribution to the strength improvement. However, there is a gradual decrease in elastic modulus along with the increasing HPT revolutions, which may be due to the dislocation tangling and residual stress. The relationship between stress and equivalent strain during HPT was established based on the stress-strain curves obtained by simulation results, and the hardening behavior during HPT processing was discussed.
Pure molybdenum material was processed by high-pressure torsion(HPT) at room temperature under the applied pressure of 6 GPa with different revolution number of 1, 2 and 5 turns, and the ultrafine-grained molybdenum was obtained. Nanoidentation technology was applied to characterize the mechanical properties of HPT-processed samples as well as the sintered one. The load-displacement curves,hardness and elastic modulus were obtained directly. The stress-strain curves of different samples were obtained based on the finite element simulation by using the software of Abaqus. The results show that the hardness of HPT-processed samples has an obvious increase from3.02 GPa to 7.80 GPa. Correspondingly, the yield strength increases significantly from 970 MPa to 3370 MPa. Grain refinement and dislocation tangling make the major contribution to the strength improvement. However, there is a gradual decrease in elastic modulus along with the increasing HPT revolutions, which may be due to the dislocation tangling and residual stress. The relationship between stress and equivalent strain during HPT was established based on the stress-strain curves obtained by simulation results, and the hardening behavior during HPT processing was discussed.
引文
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[5]Zhilyaev A P,Langdon T G.Progress in Materials Science[J],2008,53(6):893
[6]Edalati K,Toh S,Iwaoka H et al.Acta Materialia[J],2012,60(9):3885
[7]Li Ping,Wang Xue,Xue Kemin et al.International Journal of Refractory Metals and Hard Materials[J],2016,54:439
[8]Jin Qiaoling(靳巧玲),Li Guolu(李国禄),Wang Haidou(王海斗)et al.Surface Technology(表面技术)[J],2015(12):127
[9]Liu Xiaoyan(刘晓燕),Zhao Xicheng(赵西成),Yang Xirong(杨西荣).Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2017,46(3):669
[10]Li Xiaodong,Bhushan Bharat.Materials Characterization[J],2002,48(1):11
[11]Li Xuechun(李雪春),Yang Yuying(杨玉英),Bao Jun(包军)et al.Journal of Harbin Institute of Technology(哈尔滨工业大学学报)[J],2000,32(5):54
[12]Zhang Long,Cheng Guanggui,Ding Jianning et al.Chinese Journal of Sensors and Actuators[J],2012,25(6):766
[13]Liu Xuejie(刘学杰),Ma Qinfang(马琴芳),Dong Haikuan(董海宽)et al.Materials Review(材料导报)[J],2010,24(8):73
[14]Chen Zhang(陈樟),Su Wei(苏伟),Wan Min(万敏).Micronanoelectronic Technology(微纳电子技术)[J],2009,46(2):104
[15]Soer W A,Aifantis K E,Hosson J T M D.Acta Materialia[J],2005,53(17):4665
[16]Wang Chunliang(王春亮).Study on the Methods of Nanoindentation Testing(纳米压痕试验方法研究)[D].Shanghai:Shanghai Research Institute of Materials,2007
[17]Wang Y C,Langdon T G.Journal of Materials Science[J],2013,48(13):4646
[18]Kawasaki M.Journal of Materials Science[J],2014,49(1):18
[19]Mecking H,Kocks U F.Acta Metallurgica[J],1981,29(11):1865
[20]Qiao Xiaoguang,Gao Nong,Starink Marco J.Philosophical Magazine[J],2012,92(4):446