| Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity | |
| W. B. Dong; H. F. Zhang; W. S. Sun; A. M. Wang; H. Li; Z. Q. Hu | |
| 2006 | |
| Source Publication | Journal of Materials Research
 |
| ISSN | 0884-2914 |
| Volume | 21Issue:6Pages:1490-1499 |
| Abstract | (Zr62Cu15.4Ni12.6) (x=6-12) in situ glassy composites containing uniformly distributed Ta-rich particles were prepared by arc-melting and copper mould casting. The results show that addition of 6-10 at.% Ta to Zr62Cu15.4Ni12.6Al10 results in dissolution of 2.4 to 4.6 at.% Ta in the glassy matrix, which promotes glass-forming ability, and the remaining Ta precipitates out as body-centered cubic (BCC) Ta-rich particles dispersed on the glassy matrix. The critical diameters for the composites with 6, 8, and 10 at.% Ta are 7, 7, and 6 mm, respectively. At 12 at.% Ta addition, the glass-forming ability is dramatically reduced because of the precipitation of secondary dendritic Ta-rich particles and other nanocrystallites from melts during copper mould casting. Also, owing to the solid-liquid reaction during induction heating, some Ta-rich particles formed in the master alloys will redissolve into the glassy matrix, resulting in a smaller volume fraction of Ta-rich particles in the as-cast glassy rods than that of the corresponding ingots. The glassy matrix composites exhibit enhanced plastic strain of about 7.5 to 22.5% at room temperature. The optimum Ta content in the glassy alloys is determined to be 10 at.%, which corresponds to the highest ultimate stress of 2220 MPa and the largest plastic strain of 22.5%. The plastic strain increases with increasing volume fraction of in situ BCC Ta-rich particles. This is apparently ascribed to the impedance of Ta-rich particles to shear bands. Ta-rich particles seed the initiation of multiple shear bands and block the shear band propagation, leading to intensive multiplication and bifurcation of shear bands. |
| description.department | chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;zhang, hf (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;hfzhang@imr.ac.cn |
| Keyword | Bulk Metallic-glass Ductile Reinforcement Mechanical-properties Microstructure Deformation Behavior Alloys Strain Phase |
| URL | 查看原文 |
| WOS ID | WOS:000238191300019 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/34180 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | W. B. Dong,H. F. Zhang,W. S. Sun,et al. Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity[J]. Journal of Materials Research,2006,21(6):1490-1499. |
| APA | W. B. Dong,H. F. Zhang,W. S. Sun,A. M. Wang,H. Li,&Z. Q. Hu.(2006).Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity.Journal of Materials Research,21(6),1490-1499. |
| MLA | W. B. Dong,et al."Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity".Journal of Materials Research 21.6(2006):1490-1499. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment