Microstructure and Impression Creep Properties of Ca-Containing AS31 Magnesium Alloy

doi:10.1007/s40195-016-0491-1

Abstract

Abstract:

The effect of Ca addition on the microstructure and impression creep properties of AS31 magnesium alloy was investigated in the current study. The results showed that the microstructure of AS31 alloy is composed of α(Mg) phase, massive Mg₁₇Al₁₂ and some Chinese script Mg₂Si compounds. Addition of 2 wt% Ca to AS31 alloy resulted in complete elimination of Mg₁₇Al₁₂ phase and formation of Al₂Ca compound. Ca improved the alloy’s creep properties especially at higher temperature. Improvement in the creep properties was attributed to the elimination of soft Mg₁₇Al₁₂ and formation of thermally stable Al₂Ca compound. According to the obtained stress exponent and creep activation energy, pipe diffusion climb-controlled creep was estimated as the dominant creep mechanism and Ca had no influence on the dominant mechanism.

Key words: Magnesium-aluminum-silicon alloy, Calcium, Microstructure, Creep, Mechanism

Mohammad Badri,Seyyed Mehdi Miresmaeili,Bahram Nami. Microstructure and Impression Creep Properties of Ca-Containing AS31 Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(12): 1089-1097.

Figures/Tables 8

Table 1 Chemical composition of the alloys (wt%)

Alloy	Al	Si	Ca	Mg
AS31	3.04	0.85	-	Bal.
ASX311	3.12	0.87	1.06	Bal.
ASX312	3.06	0.91	1.84	Bal.

Fig. 1 SEM image of AS31 alloy accompanied with EDS spectrum of the phases shown with arrows

Fig. 2 SEM image of ASX312 alloy with two different magnifications accompanied with EDS analysis

Fig. 3 Elemental maps of the alloying elements in ASX312 alloy

Fig. 4 Plots of impression depth versus time at 476 K for a AS31, b ASX311, c ASX312

Fig. 5 Comparison of minimum creep rates obtained at different normalized stresses at a 423 K, b 447 K, c 476 K, d 491 K

Fig. 6 Variation of ln(VimpT/G) versus ln(σimp/G) at constant T for calculating the stress exponent: a AS31 alloy, b ASX311 alloy, c ASX312 alloy

Fig. 7 Variation of ln(VimpT/G) versus 1000/T at constant stresses for determining Q-values: a AS31, b ASX311, c ASX312

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