Effect of Gd Addtion on Microstructure and Mechanical Properties of Wrought AZ31 Magnesium Alloys

doi:10.11901/1005.3093.2013.759

Chinese Journal of Materials Research

2014, Vol. 28

Issue (8): 579-586 DOI: 10.11901/1005.3093.2013.759

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Effect of Gd Addtion on Microstructure and Mechanical Properties of Wrought AZ31 Magnesium Alloys

Dong LI,Yulai CHEN,Shuiping HU,Qingwu CAI(

)

National Engineering Research Center of Advanced Rolling; University of Science and Technology Beijing, Beijing 100083

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Dong LI,Yulai CHEN,Shuiping HU,Qingwu CAI. Effect of Gd Addtion on Microstructure and Mechanical Properties of Wrought AZ31 Magnesium Alloys. Chinese Journal of Materials Research, 2014, 28(8): 579-586.

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Abstract

The effect of Gd addition on the evolution of microstructure and mechanical properties of wrought AZ31 magnesium alloys was investigated. The results show that the added Gd reacts with other elements to form Al₂Gd and Al-Mn-Gd phase, leading to a reduction of β-Mg₁₇Al₁₂; for the as-cast alloy, a small amount of Gd addition weakens the grain refinement effect of Al and coarsens the grain size, then with the increasing amount of Gd addition, the grain size is reduced; for the rolled alloys, Al₂Gd can promote the dynamic recrystallization during the rolling process, which may result in the reducing of the number of twins, the weakening of the role of work hardening and the refining of grain size. However, an excess of Gd addition may induce the coarsening of second phase as well as the microstructure of the alloys. Therefore an appropriate amount of Gd addition can increase the elongation, while reduce the strength of the rolled AZ31 alloys. An optimal elongation 13.4% can be measured for the rolled AZ31-0.8Gd at 350℃, in the contrast, only 5.4% for the AZ31 without Gd addition.

Key words: metallic materials magnesium Gd rolling microstructure mechanical properties

Received: 15 October 2013

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	Dong LI
	Yulai CHEN
	Shuiping HU
	Qingwu CAI

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.759 OR https://www.cjmr.org/EN/Y2014/V28/I8/579

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

Fig.1 XRD patterns of investigated alloys: (a) AZ31; (b) AZ31-1.5Gd

Fig.2 SEM images of as-cast AZ31-1.5Gd alloys

Fig.3 Optical micrographs of as-cast alloys with different Gd addition: (a) AZ31; (b) AZ31-0.8Gd; (c) AZ31-1.5Gd; (d) AZ31-2.2Gd

Fig.4 Mean grain size of as-cast alloys with different Gd addition

Fig.5 Optical micrographs of rolled at 250℃ alloys with different Gd addition: (a) AZ31; (b) AZ31-0.8Gd; (c) AZ31-1.5Gd; (d) AZ31-2.2Gd

Fig.6 Optical micrographs of rolled at 300℃ alloys with different Gd addition: (a) AZ31; (b) AZ31-0.8Gd; (c) AZ31-1.5Gd; (d) AZ31-2.2Gd

Fig.7 Optical micrographs of rolled at 350℃ alloys with different Gd addition: (a) AZ31; (b) AZ31-0.8Gd; (c) AZ31-1.5Gd; (d) AZ31-2.2Gd

Fig.8 Optical micrographs of rolled at 400℃ alloys with different Gd addition: (a) AZ31; (b) AZ31-0.8Gd; (c) AZ31-1.5Gd; (d) AZ31-2.2Gd

Fig.9 Tensile strength of rolled at different temperature alloys with different Gd addition

Fig.10 Yield strength of rolled at different temperature alloys with different Gd addition

Fig.11 elongation of rolled at different temperature alloys with different Gd addition

Fig.12 Morphology of tensile port for investigated rolled alloys: (a) AZ31; (b) AZ31-1.5Gd

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