Effects of Minor Addition of Sr and Mn on Mechanical Properties of Micro-alloying Mg-8Li-3Al Wrought Alloy

doi:10.11901/1005.3093.2014.165

Chinese Journal of Materials Research

2014, Vol. 28

Issue (9): 649-655 DOI: 10.11901/1005.3093.2014.165

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Effects of Minor Addition of Sr and Mn on Mechanical Properties of Micro-alloying Mg-8Li-3Al Wrought Alloy

Tiancai XU¹,Xiaodong PENG^1,^2,^**(

),Bao ZHANG¹,Guobing WEI¹,Yuanfang CHEN^1,³,Junwei JIANG¹

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045
2. Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044
3. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054

Cite this article:

Tiancai XU,Xiaodong PENG,Bao ZHANG,Guobing WEI,Yuanfang CHEN,Junwei JIANG. Effects of Minor Addition of Sr and Mn on Mechanical Properties of Micro-alloying Mg-8Li-3Al Wrought Alloy. Chinese Journal of Materials Research, 2014, 28(9): 649-655.

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Abstract

The effect of minor addition of Sr and/or Mn on the microstructure and mechanical properties of the wrought Mg-8Li-3Al alloy were investigated by means of optical microscopy, scanning electron microscopy, X-ray diffraction studies, and tensile tests to reveal the variations in microstructures and mechanical behavior during processing. The results show that the alloy of Mg-8Li-3Al mainly consists of α-Mg, β-Li phases and Al₁₂Mg₁₇ intermetallic compound. Sr and Mn addition results in the precipitation of Al₄Sr and Al₂Mn₃. The microstructure of the alloy is refined with the addition of Sr and Mn, respectively. Moreover, the refining effect of Sr is better than Mn at the same mass fraction addition. The tensile strength of the alloys is improved with the addition of Sr and Mn. The tensile strength, yield stress and elongation of Mg-8Li-3Al-0.5Sr-0.5Mn alloy after extrusion are 242.15 MPa, 206.96 MPa and 22.43%, which are increased by 14.98%, 28.11% and 8.31% respectively in comparison with the those of the bare Mg-8Li-3Al alloy.

Key words: metallic material Mg-Li alloy Sr and Mn microstructure mechanical properties

Received: 03 April 2014

Fund: *Supported by National Basic Research Program of China No.2007CB613702, Natural Science Foundation of Chongqing Science and Technology Commission No.2008BB4323, International Scientific and Technological Cooperation Project No.2010DFR50010.

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	Tiancai XU
	Xiaodong PENG
	Bao ZHANG
	Guobing WEI
	Yuanfang CHEN
	Junwei JIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.165 OR https://www.cjmr.org/EN/Y2014/V28/I9/649

Fig.1 Optical micrographs of as-cast alloys: (a) LA83, (b) LA83-0.5Sr, (c) LA83-0.5Mn, (d) LA83-0.5Sr-0.5Mn

Table 1 Actual chemical compositions of the experimental alloys (mass fraction, %)

Fig.2 XRD spectra of as-cast alloys: (a) LA83, (b) LA83-0.5Sr, (c) LA83-0.5Mn, (d) LA83-0.5Sr-0.5Mn

Fig.3 SEM micrographs showing microstructure of as-cast alloys and micro-area chemical composition of the alloys by EDS: (a) LA83, (b) LA83-0.5Sr, (c) LA83-0.5Mn, (d) LA83-0.5Sr-0.5Mn

Table 2 Micro-area chemical composition of the alloys in Fig.3 by EDS analysis (mole fraction, %)

Fig.4 Optical micrographs of as-extruded alloys: (a) LA83, (b) LA83-0.5Sr, (c) LA83-0.5Mn, (d) LA83-0.5Sr-0.5Mn

Fig.5 Nominal tensile stress–strain curves of as-extruded alloys at room temperature

Fig.6 SEM images of the tensile fracture of the as-extruded alloys: (a) LA83, (b) LA83-0.5Sr, (c) LA83-0.5Mn, (d) LA83-0.5Sr-0.5Mn

Table 3 Mismatch values of potential matching planes for compounds and matrix (mass fraction, %)

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