Response of microstructure and mechanical behavior of metastable ARB-Cu to annealing process

doi:10.13251/j.issn.0254-6051.2021.02.007

Abstract

Abstract: Metastable ultrafine grained pure Cu was prepared by accumulative rolling bonding (ARB) and annealed at 100-250 ℃ for 10, 30 and 60 min respectively in order to study the effect of annealing heat treatment on its microstructure and mechanical properties. The microstructure, mechanical properties and fracture morphologies were analyzed by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM), Vickers hardness tester and universal mechanical testing machine. The results show that, as the annealing temperature increases, the ARB-Cu grain size increases slightly, the sub-grains are dispersively distributed, the dislocation density decreases gradually, and the grain shape changes from irregular to equiaxed. After annealing at 100-250 ℃ for 10 min and 30 min, the yield strength and tensile strength of the ARB-Cu increase first and then decrease with the increase of annealing temperature. The microhardness gradually decreases with the increase of annealing temperature and annealing time. Annealing at 150 ℃ for 30 min, the strength and plasticity of the annealed ARB-Cu reach the best match. The fracture mechanism of the ARB-Cu changes from cleavage fracture in preparation state to ductile fracture in annealed state gradually, and the plastic deformation ability is improved.

Key words: accumulative rolling bonding, ultrafine grained pure Cu, annealing, microstructure, mechanical behavior, fracture morphology

CLC Number:

TG146.1

Li Xiaohong, Jiang Qingwei, Li Min, Yang Peng. Response of microstructure and mechanical behavior of metastable ARB-Cu to annealing process[J]. Heat Treatment of Metals, 2021, 46(2): 37-44.

References

[1] Lu L,Shen Y,Chen X,et al.Ultrahigh strength and high electrical conductivity in copper [J].Science,2004,304(5669):422-426.
[2] Yang K H.Producing bulk ultrafine-grained materials by severe plastic deformation [J].Journal of Plasticity Engineering,2006,58(4):33-39.
[3] Tsuji N,Saito Y,Lee S H,et al.ARB (accumulative roll-bonding) and other new techniques to produce bulk ultrafine grained materials[J].Advanced Engineering Materials,2010,5(5):338-344.
[4] Langdon T G.Twenty-five years of ultrafine-grained materials:Achieving exceptional properties through grain refinement[J].Acta Materialia,2013,61(19):7035-7059.
[5] 张清龙,王军丽,侯健,等.LZ91合金在累积叠轧焊合过程中的界面焊合研究[J].金属热处理,2017,42(4):58-63.
Zhang Qinglong,Wang Junli,Hou Jian,et al.Interface bonding of LZ91 alloy by accumulative roll bonding[J].Heat Treatment of Metals,2017,42(4):58-63.
[6] 王军丽.超细晶铜材的大变形异步叠轧制备技术、组织演变过程与性能研究[D].昆明:昆明理工大学,2007.
[7] 李敏,刘静,姜庆伟.退火温度对ARB-Cu室温拉伸断裂行为的影响[J].金属学报,2017,53(8):107-116.
Li Min,Liu Jing,Jiang Qingwei.Effect of annealing temperature on tensile fracture behavior of ARB-Cu at room temperature[J].Acta Metallurgica Sinica,2017,53(8):107-116.
[8] Gubicza J,Dobatkin S V,Khosravi E,et al.Microstructural stability of Cu processed by different routes of severe plastic deformation [J].Materials Science and Engineering A,2011,528(3):1828-1832.
[9] Valiev R Z,Estrin Y,Horita Z,et al.Producing bulk ultrafine-grained materials by severe plastic deformation[J].Journal of Plasticity Engineering,2006,58(4):33-39.
[10] 张兵,王乐,张仁杰,等.热处理对累积叠轧Ti/Ni叠层复合材料组织与性能的影响[J].金属热处理,2015,40(8):113-119.
Zhang Bing,Wang Le,Zhang Renjie,et al.Effects of heat treatment on microstructure and mechanical properties of Ti/Ni multilayer composite sheet processed by accumulative roll bonding[J].Heat Treatment of Metals,2015,40(8):113-119.
[11] Shaarbaf M,Toroghinejad M R.Nano-grained copper strip produced by accumulative roll bonding process [J].Materials Science &Engineering A,2008,473(1):28-33.
[12] Hosseini S A,Manesh H D.High-strength,high-conductivity ultra-fine grains commercial pure copper produced by ARB process [J].Materials and Design,2009,30(8):2911-2918.
[13] Zhao F X,Xu X C,Liu H Q,et al.Effect of annealing treatment on the microstructure and mechanical properties of ultrafine-grained aluminum [J].Materials and Design,2014,53(1):262-268.
[14] Jiang Q W,Li X W.Effect of pre-annealing treatment on the compressive deformation and damage behavior of ultrafine-grained copper [J].Materials Science and Engineering A,2012,546:59-67.
[15] Huang X,Hansen N,Tsuji N.Hardening by annealing and softening by deformation in nanostructured metals[J].Science,2006,312(5771):249-251.
[16] Yan Y,Qi Y,Jiang Q W,et al.Temperature-dependent compressive deformation behavior of commercially pure iron processed by ECAP[J].Acta Metallurgica Sinica,2015,28:531-541.
[17] 赖春明,秦南,贾亚娟,等.退火工艺对AA3003铝合金累积叠轧板材组织性能的影响[J].金属热处理,2019,44(10):81-87.
Lai Chunming,Qin Nan,Jia Yajuan,et al.Effect of annealing on microstructure and properties of accumulative roll bonded AA3003 aluminum alloy sheet[J].Heat Treatment of Metals,2019,44(10):81-87.
[18] Valiev R Z,Sergueeva A V,Mukherjee A K.The effect of annealing on tensile deformation behavior of nanostructured SPD titanium[J].Scripta Materialia,2003,49(7):669-674.
[19] Suo T,Li Y L,Xie K,et al.The effect of temperature on mechanical behavior of ultrafine-grained copper by equal channel angular pressing [J].Materials Science and Engineering A,2010,527(21):5766-5772.
[20] 李敏,姜庆伟.预退火时间对累积叠轧超细晶铜室温拉伸断裂行为的影响[J].中国有色金属学报,2017,27(11):2307-2314.
Li Min,Jiang Qingwei.Effect of pre-annealing time on tensile deformation behavior of accumulative rolling bonding ultrafine grained Cu at room temperature[J].The Chinese Journal of Nonferrous Metal,2017,27(11):2307-2314.
[21] 汪程鹏,李付国,陆红亚,等.剧烈塑性变形制备微纳米材料的变形细化机理[J].金属热处理,2012,37(2):14-19.
Wang Chengpeng,Li Fuguo,Lu Hongya,et al.Refinement and deformation mechanism of severe plastic deformation for micron-nanometer materials[J].Heat Treatment of Metals,2012,37(2):14-19.
[22] 张宁.冷轧工业纯铝退火强化性能的研究[D].上海:上海交通大学,2010.
[23] Kamikawa N,Huang X,Tsuji N,et al.Strengthening mechanisms in nanostructured high-purity aluminium deformed to high strain and annealed[J].Acta Materialia,2009,57(14):4198-4208.