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

doi:10.11901/1005.3093.2022.112

Chinese Journal of Materials Research

2023, Vol. 37

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

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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(

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

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LIU Huan, LI Xingfu, YANG Yi, LI Cong, FU Zhengrong, BAI Yunhua, ZHANG Zhenghong, ZHU Xinkun. Room Temperature Work-Hardenning Behavior of a Novel Sandwich Sheet of Cu-Al Alloy with Gradient Structure Surfaces on Both Sides. Chinese Journal of Materials Research, 2023, 37(2): 95-101.

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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

Received: 25 February 2022

ZTFLH:

TG146.1+1

Fund: National Natural Science Foundation of China(51664033);National Natural Science Foundation of China(51901091)

About author: ZHU Xinkun, Tel: (0871)65109952, E-mail: xk_zhu@hotmail.com

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

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.112 OR https://www.cjmr.org/EN/Y2023/V37/I2/95

Fig.1 Size of tensile text samples (a), DIC speckle and observation area (b) and the area of microscopic characterization (c)

Fig.2 Microstructure of gradient layer (a) KAM map of the depth ~300 μm depth, characterized by EBSD, (b) The GND distribution map with depth, calculated by the average KAM statistics in (a), (c~e) TEM bright field image of ~30 μm, ~153 μm, ~246 μm depth, respectively

Fig.3 Comparison of true stress-strain curves before and after SMAT treatment (a, metallographic image with gradient layer in the background); TEM bright field image at gradient layer ~30 μm depth (b); Extended dislocation formation-decomposition of full dislocations into partial dislocations (c)

Fig.4 Observation of fracture features of gradient-structure sample (a) and coarse-grain sample (b)

Fig.5 Evolution of shear bands of CG sample (a) plastic strain distribution along the Y-axis at each global strain; (b) plastic strain distribution along the X-axis at each global strain

Fig.6 Evolution of shear bands of GS sample (a) plastic strain distribution along the Y-axis at each global strain; (b) plastic strain distribution along the X-axis at each global strain

Fig.7 Schematics of a GND pile-up, inducing back stress in the soft domain, which in turn induces forward stress in the hard domain^[12] (a) andstress and strain variations along thickness direction on 0.2% average strain by finite element simulation (FEM)^[30] (b)

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