Microstructure and microhardness evolution of a Mg(83)Ni(6)Zn(5)Y(6) alloy upon annealing

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	Microstructure and microhardness evolution of a Mg(83)Ni(6)Zn(5)Y(6) alloy upon annealing
	X. H. Shao; Z. Q. Yang; J. H. You; K. Q. Qiu; X. L. Ma
	2011
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	509 期号:26 页码:7221-7228
摘要	The microstructures and the corresponding microhardness evolution of a Mg(83)Ni(6)Zn(5)Y(6) (at.%) alloy subjected to a series of heat treatments were investigated. In addition to the 14H long period stacking ordered (LPSO) phase, a diamond-cubic phase with the possible space group of Fd (3) over barm and lattice parameter of a = 0.73nm were identified in the as-cast alloy. The combination of LPSO thin lamellae and the nanometer-sized cubic phase leads to a relatively high Vickers microhardness of about 116.2 +/- 13.7. When annealed at 473K and 573 K, the above diamond-cubic phase partially transforms to its structural variant, Fm (3) over barm, together with a slight change of lattice parameter (a = 0.72 nm). Precipitation of hexagonal Mg(2)Ni lath also happens at these moderate annealing temperatures. The remarkable increase of microhardness at this stage is believed to result from the strengthening of precipitates and the resultant coherent interface between the precipitates and their surrounding medium. When annealed at temperatures ranging from 673K to 773 K, the Mg(2)Ni precipitates were dissolved, grain coarsening in the alloy occurred, Fd (3) over barm phase completely transformed to its Fm (3) over barm counterpart, and consequently microhardness of the alloy was decreased significantly. (C) 2011 Elsevier B. V. All rights reserved.
部门归属	[shao, x. h.; yang, z. q.; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [you, j. h.; qiu, k. q.] shenyang univ technol, sch mat sci & engn, shenyang 110178, peoples r china.;ma, xl (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;xlma@imr.ac.cn
关键词	Mg Alloy Microstructure Microhardness Long Period Stacking Ordered Phase Intermetallic Phase Zn-y Alloys Period Ordered Structure Mechanical-properties Magnesium Alloy Solid-solution Strength Behavior System Phase Re
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30647
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. H. Shao,Z. Q. Yang,J. H. You,et al. Microstructure and microhardness evolution of a Mg(83)Ni(6)Zn(5)Y(6) alloy upon annealing[J]. Journal of Alloys and Compounds,2011,509(26):7221-7228.
APA	X. H. Shao,Z. Q. Yang,J. H. You,K. Q. Qiu,&X. L. Ma.(2011).Microstructure and microhardness evolution of a Mg(83)Ni(6)Zn(5)Y(6) alloy upon annealing.Journal of Alloys and Compounds,509(26),7221-7228.
MLA	X. H. Shao,et al."Microstructure and microhardness evolution of a Mg(83)Ni(6)Zn(5)Y(6) alloy upon annealing".Journal of Alloys and Compounds 509.26(2011):7221-7228.

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