Effects of Directional Recrystallization on Microstructure and Superelastic Property of Hot-rolled Cu71Al18Mn11 Alloy

doi:10.11901/1005.3093.2022.481

Chinese Journal of Materials Research

2023, Vol. 37

Issue (8): 571-580 DOI: 10.11901/1005.3093.2022.481

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Effects of Directional Recrystallization on Microstructure and Superelastic Property of Hot-rolled Cu71Al18Mn11 Alloy

XU Lijun¹^,², ZHENG Ce¹, FENG Xiaohui¹, HUANG Qiuyan¹(

), LI Yingju¹(

), YANG Yuansheng¹

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

XU Lijun, ZHENG Ce, FENG Xiaohui, HUANG Qiuyan, LI Yingju, YANG Yuansheng. Effects of Directional Recrystallization on Microstructure and Superelastic Property of Hot-rolled Cu71Al18Mn11 Alloy. Chinese Journal of Materials Research, 2023, 37(8): 571-580.

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Abstract

According to an orthogonal experiment design, the directional recrystallization of hot-rolled Cu71Al18Mn11 alloy with deformation degree of 75% was carried out at 800, 850 and 900℃, by drawing speed of 2, 5 and 15 μm/s respectively. The effect of process parameters on the directional recrystallization microstructure and superelasticity of the hot-rolled Cu71Al18Mn11 alloy was assessed, meanwhile, the directional recrystallization mechanism was analyzed. The results show that the directional recrystallization effect may firstly increase and then decrease with the increase of drawing speed. When the drawing speed is 2 μm/s, a small number of columnar grains emerged within the coarse equiaxed grains. When the drawing speed increases to 5 μm/s, the microstructure of columnar grains with large aspect ratio can be obtained. However, when the drawing speed further increases to 15 μm/s, the directional recrystallization microstructure is a mixture of columnar grains and equiaxed grains. The superelastic properties are better of the directionally recrystallized alloys with columnar grains of large aspect ratio. After being subjected to an applied strain of 12%, the alloy directionally recrystallized at 900℃- 5 μm/s presents a residual strain of only 1.1%, while a superelastic strain of 9.05%. The drawing velocity and hot zone temperature can affect the speed, at which the columnar grains swallowed up the primary recrystallized grains ahead in the process of directional recrystallization, thus affecting the microstructure of directionally recrystallized alloy. Once, the three speeds, i.e. the hot zone movement, the columnar grains swallowing up the primary recrystallized grains ahead and the generation of new primary recrystallization grains, all are in equilibrium, the front boundary of the existing columnar grains will continues to move forward, which will eventually promote the formation of microstructure of columnar grains with large aspect ratio.

Key words: metallic materials Cu-Al-Mn directional recrystallization superelastic property secondary recrystallization

Received: 06 September 2022

ZTFLH:

TG146.1

Fund: National Key Research and Development Program of China(2018YFE0115800)

Corresponding Authors: LI Yingju, Tel: 13840520360, E-mail: yjli@imr.ac.cn;
HUANG Qiuyan, Tel: 18512416690, E-mail: qyhuang16b@imr.ac.cn

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	XU Lijun
	ZHENG Ce
	FENG Xiaohui
	HUANG Qiuyan
	LI Yingju
	YANG Yuansheng

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.481 OR https://www.cjmr.org/EN/Y2023/V37/I8/571

Fig.1 Schematic of the core part of directional recrystallization equipment

Fig.2 Schematic of cyclic loading-unloading tensile test sample (unit:mm)

Fig.3 Temperature curves of samples before entering hot zone under different temperature gradients (a) system A; (b) system B; (c) system C

Fig.4 Optical micrographs of hot-rolled Cu71Al18Mn11 DRred at different temperature gradients (a) A-850℃-2 μm/s, (b) A-850℃-5 μm/s, (c) A-850℃-15 μm/s, (d) B-850℃-2 μm/s, (e) B-850℃-5 μm/s, (f) B-850℃-15 μm/s, (g) C-900℃-2 μm/s, (h) C-900℃-5 μm/s, (i) C-900℃-15 μm/s

Fig.5 Optical micrographs of hot-rolled Cu71Al18Mn11 DRred at different process parameters (a) 800℃-2 μm/s, (b) 800℃-5 μm/s, (c) 800℃-15 μm/s, (d) 850℃-2 μm/s, (e) 850℃-5 μm/s, (f) 850℃-15 μm/s, (g) 900℃-2 μm/s, (h) 900℃-5 μm/s, (i) 900℃-15 μm/s

Fig.6 Histogram of columnar grain size of samples DRed at different temperatures with a drawing speed of 5 μm/s

Fig.7 Cyclic loading-unloading tensile curves of hot-rolled Cu71Al18Mn11 DRed at different process parameters (a) 800℃-2 μm/s, (b) 800℃-5 μm/s, (c) 800℃-15 μm/s, (d) 850℃-2 μm/s, (e) 850℃-5 μm/s, (f) 850℃-15 μm/s, (g) 900℃- 2 μm/s, (h) 900℃-5 μm/s, (i) 900℃-15 μm/s

Fig.8 Residual strain (ε $r$ ) (a) and superelastic strain (ε $S E$ ) (b) curves of hot-rolled Cu71Al18Mn11 DRred at different process parameters

Fig.9 Relationship between superelastic strain (ε $S E$ ) and applied strain ( $ε t$ - $ε θ$ ) for DRed samples with different process parameters

Drawing velocity /μm·s^-1	2			5			15
Annealling temperature/℃	800	850	900	800	850	900	800	850	900
ε $S E M A X$ / %	6.34	7.58	9.99	7.75	7.54	11.65	3.54	4.97	8.71
ε $r M A X$ / %	6.40	6.55	4.34	10.59	4.00	4.24	5.36	9.55	9.41

Table 1 Maximum superelastic strain (ε

S E M A X

) and corresponding residual strain (ε

r M A X

) of DRed samples with different parameters

Fig.10 Overall optical micrographs of hot-rolled Cu71Al18Mn11 DRred at different temperatures with a drawing speed of 5 μm/s (a) 800℃, (b) 850℃, (c) 900℃

Fig.11 Inverse pole figure of columnar grains of samples DRred at different temperatures with a drawing speed of 5 μm/s (a) 800℃, (b) 850℃, (c) 900℃

Fig.12 Optical micrographs of hot-rolled Cu71Al18Mn11 alloy after isothermal annealing (a) 700℃-10 min, (b) 700℃-20 min, (c) 700℃-30 min, (d) 750℃-10 min, (e) 750℃-20 min, (f) 750℃-30 min

Fig.13 Inverse pole figure (a), recrystallization fraction (b) and grain boundary distribution (c) of hot rolled Cu71Al18Mn11 alloy after annealing at 700℃ for 30 min and inverse pole figure (d) and grain boundary distribution (e) after annealing at 750℃ for 20 min

Fig.14 Diagram of equiaxial grains (a) and columnar grains (b) growth in directional recrystallization

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