Hot Cracking Behavior of Mg-5Al-xCa Alloys

doi:10.11900/0412.1961.2016.00353

Acta Metall Sin

2017, Vol. 53

Issue (2): 211-219 DOI: 10.11900/0412.1961.2016.00353

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Hot Cracking Behavior of Mg-5Al-xCa Alloys

Feng WANG(

),Haikuo DONG,Zhi WANG,Pingli MAO,Zheng LIU

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

Cite this article:

Feng WANG,Haikuo DONG,Zhi WANG,Pingli MAO,Zheng LIU. Hot Cracking Behavior of Mg-5Al-xCa Alloys. Acta Metall Sin, 2017, 53(2): 211-219.

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Abstract

Mg-Al-Ca base alloys have great potential for application because of its low cost and good high temperature creep properties, but its higher hot cracking susceptibility greatly limits the application of the alloy. The effect of Ca addition on the hot cracking susceptibility of Mg-5Al-xCa (x=0.5, 1.0, 2.0, 3.0, 4.0, 5.0, mass fraction, %) alloys at the pouring temperature 700 ℃ and mold temperature 200 ℃ was studied by using hot cracking curve test, solidification curve test, OM, XRD and SEM. The results showed that the hot cracking susceptibility of alloys decreased with increasing Ca addition until to 4.0%, and the Mg-5Al-4.0Ca alloy had minimal hot cracking susceptibility, which cracking susceptibility coefficient was only 0.824. But when Ca addition increased to 5.0%, the hot cracking susceptibility of the alloy increased, and the cracking susceptibility coefficient increased to 0.96. The appropriate Ca addition can reduce the precipitation temperature of α-Mg in Mg-5Al-xCa alloys, inhibit precipitation of Mg₁₇Al₁₂ phase, narrow solidification temperature range of the alloy and increase eutectic content, which are helpful for the alloy having a stronger ability of compensation at the solidification end to decrease hot cracking susceptibility. But excessive Ca addition will increase the numbers of brittle phases containing Ca and coarsen the microstructure, resulting in the increase of hot cracking susceptibility.

Key words: Mg-Al-Ca alloy hot cracking susceptibility solidification curve microstructure

Received: 02 August 2016

Fund: Supported by National Natural Science Foundation of China (Nos.51504153 and 51571145) and Natural Science Foundation of Liaoning Province (No.201602548)

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	Feng WANG
	Haikuo DONG
	Zhi WANG
	Pingli MAO
	Zheng LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00353 OR https://www.ams.org.cn/EN/Y2017/V53/I2/211

Table 1 Chemical compositions of Mg-5Al-xCa alloys (mass fraction / %)

Fig.1 Schematic of hot cracking system (a) and hot cracking specimen (b)

Fig.2 Photographs of hot cracking specimens for Mg-5Al-xCa alloys
(a) x=0.5 (b) x=1.0 (c) x=2.0 (d) x=3.0 (e) x=4.0 (f) x=5.0

Fig.3 Hot cracking curves of Mg-5Al-xCa alloys (T—temperature)
(a) x=0.5 (b) x=1.0 (c) x=2.0 (d) x=3.0 (e) x=4.0 (f) x=5.0

Table 2 Results of hot cracking test for Mg-5Al-xCa alloys

Fig.4 Solidification curves of Mg-5Al-xCa alloys (ΔT—solidification temperature range)
(a) x=0.5 (b) x=1.0 (c) x=2.0 (d) x=3.0 (e) x =4.0 (f) x=5.0

Table 3 Key point reactions and reaction temperatures corresponding to Mg-5Al-xCa alloys solidification curves in Fig.4 (℃)

Fig.5 Solidification temperature range and hot cracking susceptibility coefficient for Mg-5Al-xCa alloys

Fig.6 Microstructures of initial hot crack (a~c) and crack extension end (d~f) of Mg-5Al-xCa alloys
(a, d) x=3.0 (b, e) x=4.0 (c, f) x=5.0

Fig.7 SEM images of Mg-5Al-xCa alloys
(a) x=0.5 (b) x=1.0 (c) x=2.0 (d) x=3.0 (e) x=4.0 (f) x=5.0

Fig.8 XRD spectra of Mg-5Al-xCa alloys

Fig.9 SEM images of the crack extension ends (a) and local magnification (b) for Mg-5Al-4.0Ca alloy (C36: hexagonal (Mg, Al)₂Ca Laves phase, C14: hexagonal Mg₂Ca Laves phase)

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