梯度结构铜铝合金的室温加工硬化行为

doi:10.11901/1005.3093.2022.112

材料研究学报

2023, Vol. 37

Issue (2): 95-101 DOI: 10.11901/1005.3093.2022.112

研究论文

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梯度结构铜铝合金的室温加工硬化行为

刘欢, 李幸福, 杨易, 李聪, 付正容, 柏云花, 张正洪, 朱心昆(

)

昆明理工大学材料科学与工程学院昆明 650093

Room Temperature Work-Hardenning Behavior of a Novel Sandwich Sheet of Cu-Al Alloy with Gradient Structure Surfaces on Both Sides

LIU Huan, LI Xingfu, YANG Yi, LI Cong, FU Zhengrong, BAI Yunhua, ZHANG Zhenghong, ZHU Xinkun(

)

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

引用本文:

刘欢, 李幸福, 杨易, 李聪, 付正容, 柏云花, 张正洪, 朱心昆. 梯度结构铜铝合金的室温加工硬化行为[J]. 材料研究学报, 2023, 37(2): 95-101.
Huan LIU, Xingfu LI, Yi YANG, Cong LI, Zhengrong FU, Yunhua BAI, Zhenghong ZHANG, Xinkun ZHU. Room Temperature Work-Hardenning Behavior of a Novel Sandwich Sheet of Cu-Al Alloy with Gradient Structure Surfaces on Both Sides[J]. Chinese Journal of Materials Research, 2023, 37(2): 95-101.

全文: PDF(15207 KB) HTML

摘要:

在液氮温度下将4 mm厚的Cu-4.5%(质量分数)Al合金板材双表面机械研磨2 min，形成~250 μm厚的梯度结构层，在梯度结构层内产生了位错、层错、纳米孪晶等缺陷密度由表及芯呈梯度减少的微观结构，用数字图像相关法研究了拉伸过程中剪切带的演变过程。结果表明，双面约束的梯度结构材料能避免应变局部化，均匀分布的应力应变使材料避免了在较早阶段塑性失稳进入颈缩阶段，较好的保持了加工硬化能力。

关键词 ：有色金属及合金, 梯度结构, 强韧化, 缺陷密度梯度, 数字图像相关法

Abstract：

The two large surfaces of Cu-4.5%Al alloy sheet of 4mm in thickness was simultaneous sujected to mechanical grinding treatment at liquid nitrogen temperature for 2 min, then a Cu-Al alloy sandwich was acquired with two sides of gradient structure layer of ~250 μm in thickness, for which there should exist a negative gradient versus the distance to the alloy center in defect density of dislocations, faults, nano-twins etc. in the two surface layers. The evolution of shear bands of the sandwich alloy during tensile process was investigated by digital image correlation method. The results show that the locally concentrating of strain can be avoided by two-sided constrained gradient structure of the sandwich material, the uniform distribution of stress and strain may be beneficial to avoid the premature of plastic instability till the necking stage, in other word, a better work hardening ability can be maintained.

Key words： nonferrous metals and alloys gradient structure toughening defect density gradient digital image correlation

收稿日期: 2022-02-25

ZTFLH:

TG146.1+1

基金资助:国家自然科学基金(51664033);国家自然科学基金(51901091)

作者简介: 刘欢，男，1996年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.112 或 https://www.cjmr.org/CN/Y2023/V37/I2/95

图1 拉伸样品尺寸、数字图像相关法斑点及观测区域以及微观表征区域

图2 梯度层的微观结构

图3 SMAT处理前后的真应力-应变曲线对比(背景为梯度层的金相显微图)、在梯度层~30 μm深度处的TEM明场像以及拓展位错的形成-全位错分解为不全位错

图4 梯度结构试样和粗晶试样的断口特征

图5 粗晶试样的剪切带演变

图6 梯度结构试样的剪切带演变

图7 GND塞积的示意图,在软区中诱导背应力，在硬区中诱导前应力[12]以及有限元模拟平均应变为0.2%应力和应变沿厚度方向的变化[30]

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