Chill-cast in situ composites in the pseudo-ternary Mg-(Cu,Ni)-Y glass-forming system: Microstructure and compressive properties

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	Chill-cast in situ composites in the pseudo-ternary Mg-(Cu,Ni)-Y glass-forming system: Microstructure and compressive properties
	H. Ma; L. L. Shi; J. Xu; E. Ma
	2007
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	22 期号:2 页码:314-325
摘要	Starting with a bulk metallic glass-forming alloy Mg61Cu18Ni6Y11, we prepared in situ composites by increasing the Mg content in a series of alloys, Mg-x(Cu0.51Ni0.17Y0.32)(100)-x (65 <= x <= 90), via copper mold casting of rods 4 mm in diameter. The fully glassy alloy at x 65 showed a compressive fracture strength of 755 MPa but no observable macroscopic plasticity prior to failure. Metallic glass-based composites were formed when the Mg content was increased. For x > 80, the glassy phase no longer existed in the as-cast rods. In the composition range of 80 <= x <= 85, needle-shaped Mg solution with a 14H-type long period stacking (LPS) structure appeared as the primary phase in the as-cast microstructure. On further increase of the Mg content up to x = 90, the solidified primary phase became 2H-Mg, coexisting with the remaining eutectic structure. The best combination of mechanical properties was obtained for the alloy at x = 81.5, which showed a fracture strength of 665 MPa and a compressive plastic strain of 11.6%. The specific strength of this alloy was 2.8 x 10(5) N m kg(-1), much higher than conventional cast magnesium alloys. The mechanical properties are discussed in light of the phase selection and microstructural features uncovered in microscopy examinations.
部门归属	chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. johns hopkins univ, dept mat sci & engn, baltimore, md 21218 usa.;xu, j (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;jianxu@imr.ac.cn
关键词	Bulk Metallic-glass Mg-cu-y Period Ordered Structure High-strength Mechanical-properties Enhanced Plasticity Matrix Composite Amorphous-alloys Room-temperature Ductility
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WOS记录号	WOS:000244210800007
引用统计	被引频次：32[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/321006/33748
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. Ma,L. L. Shi,J. Xu,et al. Chill-cast in situ composites in the pseudo-ternary Mg-(Cu,Ni)-Y glass-forming system: Microstructure and compressive properties[J]. Journal of Materials Research,2007,22(2):314-325.
APA	H. Ma,L. L. Shi,J. Xu,&E. Ma.(2007).Chill-cast in situ composites in the pseudo-ternary Mg-(Cu,Ni)-Y glass-forming system: Microstructure and compressive properties.Journal of Materials Research,22(2),314-325.
MLA	H. Ma,et al."Chill-cast in situ composites in the pseudo-ternary Mg-(Cu,Ni)-Y glass-forming system: Microstructure and compressive properties".Journal of Materials Research 22.2(2007):314-325.