Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses

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	Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses
	Yang, B. J.; Lu, W. Y.; Zhang, J. L.; Wang, J. Q.; Ma, E.; Wang, JQ (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
刊名	NATURE PUBLISHING GROUP
	2017-09-08
卷号	7 页码:-
ISSN号	2045-2322
英文摘要	Salt-fluxing treatment is an effective technique to improve the glass-forming ability (GFA) of bulk metallic glass (BMG)-forming melts, as demonstrated before in Pd- and Fe-based systems. However, it has been challenging to develop similar fluxing protocol for more reactive melts, such as Al-rich BMG-forming systems. Here we design new fluxing agents, from a thermodynamics perspective that takes into account combined effects of physical absorption and chemical absorption (reaction) between the fluxing agents and oxide inclusions. MgCl2-CaCl2 composite salts were selected, and their fluxing effects were systematically studied on an Al86Ni6.75Co2.25Y3.25La1.75 alloy, the best BMG-forming composition reported thus far for Al-rich alloy systems. The oxygen content was found to continuously decrease in the master alloy with increasing cycles of salt-fluxing treatment, with chlorate products on the surface suggesting concurrent physical absorption and chemical reaction. The fluxing treatment developed has enabled a record critical size (diameter) of 2.5 mm for Al-based BMGs. Our finding is thus an advance in developing highly desirable Al-based BMGs, and also provides guidance for designing processing protocol to produce larger-sized BMGs in other reactive systems.; Salt-fluxing treatment is an effective technique to improve the glass-forming ability (GFA) of bulk metallic glass (BMG)-forming melts, as demonstrated before in Pd- and Fe-based systems. However, it has been challenging to develop similar fluxing protocol for more reactive melts, such as Al-rich BMG-forming systems. Here we design new fluxing agents, from a thermodynamics perspective that takes into account combined effects of physical absorption and chemical absorption (reaction) between the fluxing agents and oxide inclusions. MgCl2-CaCl2 composite salts were selected, and their fluxing effects were systematically studied on an Al86Ni6.75Co2.25Y3.25La1.75 alloy, the best BMG-forming composition reported thus far for Al-rich alloy systems. The oxygen content was found to continuously decrease in the master alloy with increasing cycles of salt-fluxing treatment, with chlorate products on the surface suggesting concurrent physical absorption and chemical reaction. The fluxing treatment developed has enabled a record critical size (diameter) of 2.5 mm for Al-based BMGs. Our finding is thus an advance in developing highly desirable Al-based BMGs, and also provides guidance for designing processing protocol to produce larger-sized BMGs in other reactive systems.
学科主题	Multidisciplinary Sciences
语种	英语
资助机构	National Key Research and Development Program of China [2016YFB1100204]; National Natural Science Foundation of China [51471166, 51131006]; US-National Science Foundation, Division of Materials Research [NSF-DMR-1505621]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79102]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, JQ (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Yang, B. J.,Lu, W. Y.,Zhang, J. L.,et al. Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses[J]. NATURE PUBLISHING GROUP,2017,7:-.
APA	Yang, B. J.,Lu, W. Y.,Zhang, J. L.,Wang, J. Q.,Ma, E.,&Wang, JQ .(2017).Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses.NATURE PUBLISHING GROUP,7,-.
MLA	Yang, B. J.,et al."Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses".NATURE PUBLISHING GROUP 7(2017):-.