Effect of Cu Addition on Microstructure, Mechanical Property and Texture Evolution of Extrusion-shearing ZK60 Mg-alloy

doi:10.11901/1005.3093.2019.281

Chinese Journal of Materials Research

2019, Vol. 33

Issue (12): 881-891 DOI: 10.11901/1005.3093.2019.281

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Effect of Cu Addition on Microstructure, Mechanical Property and Texture Evolution of Extrusion-shearing ZK60 Mg-alloy

Shuai DAI^1,²,Feng WANG^1,²(

),Zhi WANG^1,²,Zheng LIU^1,²,Pingli MAO^1,²

1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2. Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province, Shenyang 110870, China

Cite this article:

Shuai DAI,Feng WANG,Zhi WANG,Zheng LIU,Pingli MAO. Effect of Cu Addition on Microstructure, Mechanical Property and Texture Evolution of Extrusion-shearing ZK60 Mg-alloy. Chinese Journal of Materials Research, 2019, 33(12): 881-891.

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Abstract

The as-cast Mg-alloys ZK60 and ZK60+1.0Cu (mass fraction, %) were fabricated by permanent mold casting, then, the homogenization heat treatment and two-step extrusion-shearing process were performed for the alloys. The microstructure, phase constitution and mechanical properties of the extrusion-shearing alloys were characterized by means of OM, SEM, EDS, XRD, EBSD, TEM and tensile-compression test at ambient temperature. Results indicated that the ternary MgZnCu phase could be observed in the interiors of α-Mg matrix of the alloy with addition of 1.0Cu. The quantitatively measured average grain size of α-Mg matrix of ZK60+1.0Cu alloy in the forming area was 1.56 μm, which was much less than that of ZK60 alloy (4.68 μm). Furthermore, the sub-grains of 300±45 nm in size were observed around the MgZnCu phase. The ZK60+1.0Cu alloy in the forming area possessed weaker {0001} basal texture while the angle between basal pole and extrusion direction (ED) was changed as compared with ZK60 alloy, resulted in the existence of more dynamic recrystallization (DRX) grains, which was beneficial to {0001}<11 $2 ˉ$ 0> basal slip. The tensile and compressive strength of ZK60+1.0Cu alloy in the forming area was obviously higher than that of ZK60 alloy owing to the grain boundary strengthening, and the occurrence of micro-voids near or within the fractured MgZnCu phase mainly accounted for the decrease of tensile elongation.

Key words: metallic materials Mg-Zn-Cu-Zr alloy microstructure texture evolution mechanical property

Received: 29 May 2019

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(51504153);Liaoning Revitalization Talents Program(XLYC1807021);Youth Project of Liaoning Education Department(LQGD2017032);Innovation Talent Program in Sciences and Technologies for Young and Middle-aged Scientists of Shenyang(RC180111)

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	Shuai DAI
	Feng WANG
	Zhi WANG
	Zheng LIU
	Pingli MAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.281 OR https://www.cjmr.org/EN/Y2019/V33/I12/881

Table 1 Chemical compositions of the alloys (mass fraction, %)

Fig.1 The diagram of two-step extrusion-shearing process

Fig.2 OM images of microstructure of extrusion-shearing alloys in extrusion and forming areas (a, b) ZK60 (c, d) ZK60+1.0Cu

Fig.3 SEM images of extrusion-shearing alloys in forming area (a) ZK60, (c) ZK60+1.0Cu, and EDS analyses of (b) MgZn₂ and (d) MgZnCu

Fig.4 SEM image and distribution of elements of extrusion-shearing ZK60+1.0Cu alloy in the forming area

Fig.5 XRD spectra of extrusion-shearing ZK60 and ZK60+1.0Cu alloys (a) extrusion area (b) forming area

Fig.6 TEM images of extrusion-shearing ZK60+1.0Cu alloy in the forming area

Fig.7 EBSD orientation and pole figures of extrusion-shearing alloys (a) ZK60, (b) ZK60+1.0Cu

Fig.8 Strain distribution and pole figures of local region of extrusion-shearing alloys (a) ZK60, (b) ZK60+1.0Cu

Fig.9 Distribution of misorientation angle of extrusion-shearing alloys in forming area (a) ZK60, (b) ZK60+1.0Cu

Fig.10 Schmid factor for basal slip of extrusion-shearing alloys in the forming area (a) ZK60, (b) ZK60+1.0Cu

Fig.11 (a) Tensile and (b) compressive stress-strain curves of extrusion-shearing alloys in the forming area

Table 2 Tensile and compression test results of extrusion-shearing alloys in the forming area

Fig.12 SEM images of tensile fracture surface and microstructure of extrusion-shearing alloys in the forming area (a) ZK60 and (b, c) ZK60+1.0Cu, and EDS analysis of (d) MgZnCu and (e) MgZn₂

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