变形速率对<strong>GH3625</strong>合金弹<strong>-</strong>塑性变形行为的影响

doi:10.11900/0412.1961.2020.00508

金属学报

2022, Vol. 58

Issue (5): 695-708 DOI: 10.11900/0412.1961.2020.00508

研究论文

本期目录 | 过刊浏览

变形速率对GH3625合金弹-塑性变形行为的影响

高钰璧¹^,²^,³, 丁雨田¹^,²(

), 李海峰⁴, 董洪标⁵(

), 张瑞尧⁶, 李军⁵, 罗全顺³

^1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州 730050
^2.兰州理工大学材料科学与工程学院兰州 730050
^3.Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK
^4.北京有色金属研究总院有色金属材料制备加工国家重点实验室北京 100088
^5.Department of Engineering, University of Leicester, Leicester LE1 7RH, UK
^6.Engineering & Innovation, Open University, Milton Keynes MK7 6AA, UK

Effect of Deformation Rate on the Elastic-Plastic Deformation Behavior of GH3625 Alloy

GAO Yubi¹^,²^,³, DING Yutian¹^,²(

), LI Haifeng⁴, DONG Hongbiao⁵(

), ZHANG Ruiyao⁶, LI Jun⁵, LUO Quanshun³

^1.State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
^2.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
^3.Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK
^4.State Key Laboratory of Nonferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing 100088, China
^5.Department of Engineering, University of Leicester, Leicester LE1 7RH, UK
^6.Engineering & Innovation, Open University, Milton Keynes MK7 6AA, UK

引用本文:

高钰璧, 丁雨田, 李海峰, 董洪标, 张瑞尧, 李军, 罗全顺. 变形速率对GH3625合金弹-塑性变形行为的影响[J]. 金属学报, 2022, 58(5): 695-708.
Yubi GAO, Yutian DING, Haifeng LI, Hongbiao DONG, Ruiyao ZHANG, Jun LI, Quanshun LUO. Effect of Deformation Rate on the Elastic-Plastic Deformation Behavior of GH3625 Alloy[J]. Acta Metall Sin, 2022, 58(5): 695-708.

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摘要:

利用原位中子衍射室温压缩实验、EBSD和TEM等手段研究了变形速率对GH3625合金弹-塑性变形行为的影响。结果表明,GH3625合金宏观应力-应变曲线包括弹性变形阶段(施加应力σ ≤ 300 MPa)、弹-塑性转变阶段(300 MPa < σ ≤ 350 MPa)和塑性变形阶段(σ > 350 MPa),这与细观晶格应变行为一致。同时,变形速率与晶体弹性和塑性各向异性密切相关。通过特定hkl反射的晶格应变、峰宽和强度的研究结果表明,变形速率对晶体弹性各向异性影响较小,而对晶体塑性各向异性影响较大。随变形速率的增加,大角度晶界逐渐向小角度晶界转变,孪晶界的比例逐渐减小,晶粒由均匀变形向不均匀变形转变。随变形速率的增加,合金的总位错密度(ρ)先减小后增加,而几何必须位错密度(ρ^GND)单调递增,统计存储位错密度(ρ^SSD)单调递减；同时,试样在变形速率为0.2 mm/min时表现出反常的加工硬化行为,这主要与均匀变形产生的统计储存位错(SSD)有关；此外,位错强化贡献和TEM观察证实了GH3625合金的塑性变形机制以位错滑移为主,其加工硬化机制是位错强化。

关键词 ： GH3625合金, 变形速率, 原位中子衍射, 晶格应变, 弹-塑性各向异性

Abstract：

GH3625 alloy is a typical polycrystalline material. The mechanical properties of a crystal within the alloy depend on the single crystal properties, lattice orientation, and orientations of neighboring crystals. However, accurate determination of single crystal properties is critical in developing a quantitative understanding of the micromechanical behavior of GH3625. In this study, the effect of deformation rate on the elastoplastic deformation behavior of GH3625 was investigated using in situ neutron diffraction room-temperature compression experiments, EBSD, and TEM. The results showed that the microscopic stress-strain curve included elastic deformation (applied stress σ ≤ 300 MPa), elastoplastic transition (300 MPa < σ ≤ 350 MPa), and plastic deformation (σ > 350 MPa) stages, which agreed with the mesoscopic lattice strain behavior. Meanwhile, the deformation rate was closely related to the crystal elastic and plastic anisotropy. The results of the lattice strain, peak width, and peak intensity reflected by the specific hkl showed that the deformation rate had little effect on the elastic anisotropy of the crystal, but had a significant effect on the plastic anisotropy of the crystal. With the increase in the deformation rate, the high angle grain boundaries gradually changed to the low angle grain boundaries, and the proportion of twin boundaries gradually reduced. Also, the grains transformed from uniform deformation to nonuniform deformation. Moreover, with the increase in deformation rate, the total dislocation density (ρ) of the alloy first decreased and then increased, whereas the geometrically necessary dislocation density (ρ^GND) monotonically increased, and the statistically stored dislocation (SSD) density (ρ^SSD) monotonically decreased. Meanwhile, the abnormal work hardening behavior of the sample at a deformation rate of 0.2 mm/min was mainly related to the SSD generated by uniform deformation. Additionally, the contribution of dislocation strengthening and TEM observation confirmed that the dominant deformation of GH3625 was dislocation slip, and its work hardening mechanism was dislocation strengthening.

Key words： GH3625 alloy deformation rate in situ neutron diffraction lattice strain elastic and plastic anisotropy

收稿日期: 2020-12-18

ZTFLH:

TG146.15

基金资助:国家重点研发计划项目(2017YFA0700703);国家自然科学基金项目(51661019);甘肃省科技重大专项项目(145RTSA004);兰州理工大学红柳一流学科建设计划项目,兰州理工大学优秀博士学位论文培育计划项目,兰州理工大学优秀学生出国(境)学习交流基金和省部共建国家重点实验室合作交流基金项目

作者简介: 高钰璧,男,1991年生,博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00508 或 https://www.ams.org.cn/CN/Y2022/V58/I5/695

图1 GH3625合金在不同变形速率(r)下的压缩应力-应变曲线和加工硬化率曲线

图2 不同变形速率下GH3625合金压缩变形过程中的中子衍射图演变

表1 r = 0.2 mm/min时不同应力/应变、不同(hkl)晶面上GH3625合金的晶面间距(d)、衍射峰强度(I)和半峰全宽(FWHM)

表2 r = 0.5 mm/min时不同应力/应变、不同(hkl)晶面上GH3625合金的d、I和FWHM

表3 r = 1.0 mm/min时不同应力/应变、不同(hkl)晶面上GH3625合金的d、I和FWHM

图3 不同变形速率、不同(hkl)晶面上GH3625合金晶格应变与施加应力的关系

表4 不同变形速率下GH3625合金的弹性模量(Ehkl )和Young's模量各向异性(rE )

图4 不同变形速率、不同(hkl)晶面上GH3625合金压缩变形过程中的衍射峰强度演变

图5 不同变形速率、不同(hkl)晶面上GH3625合金压缩变形过程中的衍射峰宽化演变

图6 不同状态下GH3625合金的微观组织及其应变分布特征演变

图7 不同状态下GH3625合金的取向差分布演变

图8 GH3625合金在0.5 mm/min变形速率压缩变形后组织的TEM像

图9 GH3625合金不同状态下的几何必须位错密度(ρGND)分布和平均ρGND

图10 不同变形速率下GH3625合金的总位错密度(ρ)随应变的变化规律和位错强化贡献

表5 不同变形速率下GH3625合金压缩变形后的ρ、ρGND和统计存储位错密度(ρSSD) (1014 m-2)

图11 不同状态下GH3625合金的晶粒取向分布函数(ODF)截面图

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