EFFECT OF Mn ON HOT CRACKING TENDENCY OF Mg-6.5Zn ALLOYS

doi:10.11900/0412.1961.2014.00157

Acta Metall Sin

2014, Vol. 50

Issue (10): 1237-1243 DOI: 10.11900/0412.1961.2014.00157

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EFFECT OF Mn ON HOT CRACKING TENDENCY OF Mg-6.5Zn ALLOYS

LI Haoyu, BAI Yuanyuan, ZHANG Haitao, WU Xin, ZHANG Zhiqiang, LE Qichi(

)

The Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819

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LI Haoyu, BAI Yuanyuan, ZHANG Haitao, WU Xin, ZHANG Zhiqiang, LE Qichi. EFFECT OF Mn ON HOT CRACKING TENDENCY OF Mg-6.5Zn ALLOYS. Acta Metall Sin, 2014, 50(10): 1237-1243.

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Abstract

Mg-Zn-Mn alloy has high hot cracking tendency (HCT), but few researches focus on its hot cracking behavior and mechanism. The effect of Mn on the HCT of Mg-6.5Zn-xMn alloys was studied by the designed equipment which can measure and record the subtle changes of temperature, shrinkage displacement and shrinkage stress during solidification in this study. The results indicate that the larger the maximum contract rate (v_max) and the stress accumulating coefficient (k), which are put forward to evaluate HCT, the higher the HCT is, and there is higher HTC when v_max or k presents at high fraction of solid. The v_max of Mg-6.5Zn-xMn alloy increases with the increase of Mn content, however its position move towards to lower fraction of solid, and the k reaches the maximum value and presents at high fraction of solid at 0.35%Mn, which means the greatest HCT in this composition. The hot cracks of these alloys initiated and propagated at final stage of solidification (with higher fraction of solid), and the intergranular feeding channels could be observed. The thicker the liquid film around grains formed by the low melting point phases and the finer the grains, the less the HCT of the alloy is. After dendritic separation, interdendritic bridging formed by the jointing of dendrite arms could enhance the adhesive force between grains at final stage of solidification. However, the break of interdendritic bridging due to the hindrance to grain contraction would result in the hot cracks.

Key words: Mg-6.5Zn alloy Mn magnesium alloy hot cracking

Received: 02 April 2014

ZTFLH:	TG146.22
	TG113.26

Fund: Supported by National Basic Research Program of China (No.2013CB632203)

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	Haoyu LI
	Yuanyuan BAI
	Haitao ZHANG
	Xin WU
	Zhiqiang ZHANG
	Qichi LE

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00157 OR https://www.ams.org.cn/EN/Y2014/V50/I10/1237

Table 1 Chemical compositions of tested alloys

Fig.1 Schematic diagram of free contraction displacement tested module

Fig.2 Schematic diagram of blocked contraction stress tested module

Fig.3 Schematic diagram of pouring and temperature collection

Fig.4 Temperature-fraction of solid (f_s) curves of tested alloys

Fig.5 Free contraction time-temperature/displacement/displacement change rate (dl/dt) curves of Mg-6.5Zn-0.35Mn alloy (T—temperature)

Fig.6 Maximum contract rate (v_max) and fraction of solid of tested alloys

Fig.7 Blocked contraction time-temperature/stress curves (a) and temperature-stress/stress change rate (ds/dt) curves (b) of Mg-6.5Zn-0.35Mn alloy

Fig.8 Macrograph of hot cracking fracture of Mg-6.5Zn-0.35Mn alloy

Fig.9 Effects of Mn on stress accumulating coefficient (k)(a) and fraction of solid of stress accumulating (b)

Fig.10 OM images of the last part of solidification of Mg-6.5Zn-0.35Mn alloy (a) and Mg-6.5Zn-1.00Mn alloy (b)

Fig.11 OM image of Mg-6.5Zn-0.35Mn alloy near the hot crack fracture (Arrows A show microcracking; arrows B show feeding channels)

Fig.12 SEM images of hot crack fracture morphologies of Mg-6.5Zn-0.35Mn alloy

(a) the liquid films

(b) the interdendritic bridgings and warty drapes

[1]	Luo A, Renaud J, Nakatsugawa J, Plourde J. JOM, 1995; 47(7): 28
[2]	Luo Z P, Zhang S Q. Acta Metall Sin, 1993; 29: A176
	(罗治平, 张少卿. 金属学报, 1993; 29: A176)
[3]	Li J H, Jie W Q, Yang G Y. Rear Met Mater Eng, 2008; 37: 1587
	(李杰华, 介万奇, 杨光昱. 稀有金属材料与工程, 2008; 37: 1587)
[4]	Lee J Y, Lim H K, Kim D H, Kim W T, Kim D H. Mater Sci Eng, ,2007; A449-451: 987
[5]	Wang Y D, Wu G H, Liu W C, Pang S, Zhang Y, Ding W J. Trans Nonferrous Met Soc China, 2013; 23: 3611
[6]	Li X, Liu J W, Luo C P. Acta Metall Sin, 2006; 42: 733
	(李萧, 刘江文, 罗承萍. 金属学报, 2006; 42: 733)
[7]	Li A W, Liu J W, Wu C L, Luo C P, Jiao D L, Zhu H M. Chin J Nonferrous Met, 2010; 20: 1487
	(李爱文, 刘江文, 伍翠兰, 罗承萍, 焦东玲, 朱红梅. 中国有色金属学报, 2010; 20: 1487)
[8]	Zhu H M, Luo C P, Liu J W, Jiao D L. Trans Nonferrous Met Soc China, 2014; 24: 316
[9]	Chen X Q, Liu J W, Luo C P. Mater Rev, 2008; 22(5): 58
	(陈晓强, 刘江文, 罗承萍. 材料导报, 2008; 22(5): 58)
[10]	Rosalbino F, Negri S D, Scavino G. J Biomed Mater Res, 2013; 101A: 704
[11]	Yuan J W, Zhang K, Zhang X H, Li X G, Li T, Li Y J, Ma M L, Shi G L. J Alloys Compd, 2013; 578: 32
[12]	Zhang E L, Yin D S, Xu L P, Yang L, Yang K. Mater Sci Eng, 2009; C29: 987
[13]	Zhang D F, Qi F G, Shi G L, Dai Q W. Rare Met Mater Eng, 2010; 12: 2205
	(张丁非, 齐福刚, 石国梁, 戴庆伟. 稀有金属材料与工程, 2010; 12: 2205)
[14]	Bai Q L, Li H X, Zhuang L Z, Zhang J S. Foundry, 2013; 62: 25
	(白清领, 李宏祥, 庄林忠, 张济山. 铸造, 2013; 62: 25)
[15]	Borland J C. Welding Met Fabr, 1979; 3: 99
[16]	Li Q C. Mechanism of Casting Formation. Beijing: China Machine Press, 1982: 252
	(李庆春. 铸件形成理论基础. 北京: 机械工业出版社, 1982: 252)
[17]	Clyne T W, Davies G J. Brit Found, 1981; 74: 65
[18]	Ding H, Fu H Z, Liu Z Y. Acta Metall Sin, 1997; 33: 921
	(丁浩, 傅恒志, 刘忠元. 金属学报, 1997; 33: 921)
[19]	Suyitno S T, Kool W, Katgerman L. Metall Mater Trans, 2009; 40A: 2388
[20]	Rappaz M, Drezet J M, Gremaud M. Metall Mater Trans, 1999; 30A: 449
[21]	Novikov I I, Novik F S. Doklady Akademii Nauk SSSR, 1963; 7: 1153
[22]	Novikov I I, Grushko O E. Mater Sci Technol, 1995; 11: 926
[23]	Cao G, Kou S. Mater Sci Eng, 2006; A417: 230
[24]	Ding H, Fu H Z. Rear Met Mater Eng, 2000; 9: 228
	(丁浩, 傅恒志. 稀有金属材料与工程, 2000; 9: 228)

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