| 摘要 | The Zr-Ce-La system is characterized by a miscibility gap and a monotectic reaction. It separates into Zr-rich and CeLa-rich liquids upon cooling through the gap. Based on this system, a new Zr-Ce-La-Al-Co monotectic system was created to synthesize liquid-phase-separated bulk metallic glasses (LPS-BMGs) by copper mold casting. A systematical investigation was performed for the effects of the relative atomic ratios of Zr:CeLa, Co:Al and Ce:La on the microstructure features and chemical compositions of the two coexistent phases. Dual atom pairs with positive heat of mixing (Zr-Ce: +12 kJ mol(-1) and Zr-La: +13 kJ mol(-1)) are originally adopted to develop such LPS-BMGs. A series of in situ formed LPS-BMGs with a critical thickness of 2.5 mm has been successfully synthesized. By combining the kinetics of liquid liquid phase separation with the formation of metallic glasses, the mechanisms of phase formation and the microstructure evolution in the rapidly cooled alloys are discussed in detail. Furthermore, a thermodynamic model is proposed for LPS-BMG design, attempting to build a bridge from monotectic/immiscible (M/I) alloys to LPS-BMGs. This work not only provides opportunities for new insights into the synthesis of LPS-BMGs and their properties but also opens new perspectives for processing and research of M/I alloys. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 部门归属 | [he, j.
; mattem, n.
; tan, j.
; kaban, i.
; wang, z.
; eckert, j.] ifw dresden, inst complex mat, d-01171 dresden, germany. [he, j.
; zhao, j. z.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [ratke, l.] german aerosp ctr, inst mat phys space, d-51147 cologne, germany. [kim, d. h.] yonsei univ, ctr noncrystalline mat, dept mat sci & engn, seoul 120749, south korea. [kim, w. t.] cheongju univ, dept opt engn, cheongju 360764, south korea. [eckert, j.] tech univ dresden, inst mat sci, d-01062 dresden, germany.
; he, j (reprint author), ifw dresden, inst complex mat, pob 27 01 16, d-01171 dresden, germany.
; j.he@ifw-dresden.de
|
| APA |
J. He.,N. Mattem.,J. Tan.,J. Z. Zhao.,I. Kaban.,...&J. Eckert.(2013).A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses: Design, microstructure and phase evolution.Acta Materialia,61(6),2102-2112.
|
修改评论