Effect of Bi on Microstructure and Mechanical Properties of Mg-3Al-3Nd Alloy

doi:10.11901/1005.3093.2019.599

Chinese Journal of Materials Research

2020, Vol. 34

Issue (6): 425-433 DOI: 10.11901/1005.3093.2019.599

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Effect of Bi on Microstructure and Mechanical Properties of Mg-3Al-3Nd Alloy

CHEN Liang, WANG Liping, FENG Yicheng(

), WANG Lei, ZHAO Sicong

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

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CHEN Liang, WANG Liping, FENG Yicheng, WANG Lei, ZHAO Sicong. Effect of Bi on Microstructure and Mechanical Properties of Mg-3Al-3Nd Alloy. Chinese Journal of Materials Research, 2020, 34(6): 425-433.

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Abstract

The effect of Bi on the microstructure and mechanical properties of Mg-3Al-3Nd alloy was investigated by scanning electron microscope (SEM), optical microscope (OM), X-ray diffraction (XRD) and tensile test. The results show that the addition of Bi can refine the microstructure of Mg-3Al-3Nd alloy. When the content (mass fraction) of Bi is 1% the grain size of Mg-3Al-3Nd alloy is the smallest, whilst the grain size reduced from 1854±58 μm for the plain Mg-3Al-3Nd alloy to 890±64 μm for the alloy with 1% Bi addition. The Mg-3Al-3Nd alloy is mainly composed of Al₁₁Nd₃ phase distributed at grain boundaries and granular Al₂Nd distributed within grains. With the increasing Bi content, the volume fraction of Al₁₁Nd₃ phase and Al₂Nd phase decrease, and the volume fraction of BiNd phase distributed within grains increases. The mechanical properties of Mg-3Al-3Nd alloy at room temperature and high temperature are significantly improved with addition of Bi. The ultimate tensile strength and elongation at break of Mg-3Al-3Nd alloy with 1% Bi addition at room temperature and high temperature is 167±2.3 MPa and 16.1±0.3%, 136±1.7 MPa and 19.3±0.3%, respectively.

Key words: metallic materials magnesium alloy Bi microstructure mechanical property

Received: 24 December 2019

ZTFLH:

TG113.12

Fund: National Natural Science Foundation of China(51804090);Heilongjiang Province Science Foundation(E2018045)

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	Liang CHEN
	Liping WANG
	Yicheng FENG
	Lei WANG
	Sicong ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.599 OR https://www.cjmr.org/EN/Y2020/V34/I6/425

Table 1 Nominal chemical composition of the test alloy(mass fraction， %)

Fig.1 Dimensions of the tensile specimen (unit: mm)

Fig.2 Low power optical micrographs of Mg-3Al-3Nd-xBi alloy (a) Mg-3Al-3Nd; (b) Mg-3Al-3Nd-1Bi; (c) Mg-3Al-3Nd-2Bi; (d) Mg-3Al-3Nd-3Bi

Fig.3 Grain size of Mg-3Al-3Nd-xBi alloy

Fig.4 XRD diffraction patterns of Mg-3Al-3Nd-xBi alloy

Fig.5 Optical micrographs of the Mg-3Al-3Nd-xBi Alloy (a) Mg-3Al-3Nd; (b) Mg-3Al-3Nd-1Bi; (c) Mg-3Al-3Nd-2Bi; (d) Mg-3Al-3Nd-3Bi

Fig.6 SEM morphology of Mg-3Al-3Nd-xBi alloy (a) (e) Mg-3Al-3Nd; (b) (f) Mg-3Al-3Nd-1Bi; (c) (g) Mg-3Al-3Nd-2Bi; (d) (h) Mg-3Al-3Nd-3Bi

Table 2 Results of EDS analysis corresponding to each point in Fig.6 (%， atom fraction)

Table 3 Formation enthalpies of phases in Mg-Al-Nd-Bi alloy

Fig.7 Tensile properties of Mg-3Al-3Nd-xBi alloy at room temperature

Fig.8 Tensile properties of Mg-3Al-3Nd-xBi alloy at high temperature

Fig.9 Room temperature tensile fracture morphology of as-cast Mg-3Al-3Nd-xBi alloy (a) Mg-3Al-3Nd; (b) Mg-3Al-3Nd-1Bi; (c) Mg-3Al-3Nd-2Bi; (d) Mg-3Al-3Nd-3Bi

Fig.10 High temperature tensile fracture morphology of Mg-3Al-3Nd-xBi alloy (a) Mg-3Al-3Nd; (b) Mg-3Al-3Nd-1Bi; (c) Mg-3Al-3Nd-2Bi; (d) Mg-3Al-3Nd-3Bi

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