The Minor Precipitation at the Final Stage of U720Li Solidification

IMR OpenIR

	The Minor Precipitation at the Final Stage of U720Li Solidification
	Zhao, Guang-Di; Yu, Lian-Xu; Qi, Feng; Liu, Fang; Sun, Wen-Ru; Hu, Zhuang-Qi; Sun, WR (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
	2016-06-01
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
卷号	29 期号:6 页码:518-526
摘要	The minor precipitations caused by B and Zr which are the normal constituents of U720Li alloy have been studied by analyzing the solidification process and the composition evolution. The present study aims to supply the elementary information about the existing form of B and Zr in the as-cast microstructure, which is helpful for the subsequent processing, such as homogenization treatment. The M3B2 and Ni5Zr phases were observed in the U720Li alloy in as-cast state, which were usually accompanying with each other together with eta-Ni3Ti phase at the edge of eutectic (gamma + gamma'). Combining the DTA analysis and heating and quenching tests, the solidification sequence was determined to be the following: gamma matrix, eutectic (gamma + gamma'), eta-Ni3Ti, M3B2 and Ni5Zr. The in situ composition analysis by EDS and EPMA revealed that the precipitation and microstructure were governed by the composition evolution in the liquids. The solidification of gamma matrix increased the Ti concentration in the residual liquids and resulted in the eutectic (gamma + gamma') formation; the (gamma + gamma') formation increased the Ti/Al radio in the liquids and the eta-Ni3Ti was formed in front of the eutectic (gamma + gamma'); the eta-Ni3Ti precipitation consumed up Al and Ti and increased the concentration of B, Mo and Cr, and M3B2 boride is formed; the previous precipitation of the phases consumed up most of the elements other than Ni and Zr, and Ni5Zr is formed finally. The melting points are in the ranges of 1130-1140 degrees C for Ni5Zr phase, 1180-1190 degrees C for M3B2 boride and 1190-1200 degrees C for eta-Ni3Ti phase.
部门归属	[zhao, guang-di ; yu, lian-xu ; qi, feng ; liu, fang ; sun, wen-ru ; hu, zhuang-qi] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [zhao, guang-di] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china
关键词	Superalloy U720li Solidification M3b2 Boride Ni5zr Phase
学科领域	Metallurgy & Metallurgical Engineering
收录类别	sci
语种	英语
WOS记录号	WOS:000377182300002
引用统计	被引频次：19[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75848
专题	中国科学院金属研究所
通讯作者	Sun, WR (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Zhao, Guang-Di,Yu, Lian-Xu,Qi, Feng,et al. The Minor Precipitation at the Final Stage of U720Li Solidification[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2016,29(6):518-526.
APA	Zhao, Guang-Di.,Yu, Lian-Xu.,Qi, Feng.,Liu, Fang.,Sun, Wen-Ru.,...&Sun, WR .(2016).The Minor Precipitation at the Final Stage of U720Li Solidification.ACTA METALLURGICA SINICA-ENGLISH LETTERS,29(6),518-526.
MLA	Zhao, Guang-Di,et al."The Minor Precipitation at the Final Stage of U720Li Solidification".ACTA METALLURGICA SINICA-ENGLISH LETTERS 29.6(2016):518-526.