| 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 | |
| Source Publication | Journal of Materials Research
 |
| ISSN | 0884-2914 |
| Volume | 22Issue:2Pages:314-325 |
| Abstract | 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. |
| description.department | 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 |
| Keyword | Bulk Metallic-glass Mg-cu-y Period Ordered Structure High-strength Mechanical-properties Enhanced Plasticity Matrix Composite Amorphous-alloys Room-temperature Ductility |
| URL | 查看原文 |
| WOS ID | WOS:000244210800007 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/33748 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation 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. |
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