期刊
INTERMETALLICS
卷 34, 期 -, 页码 1-9出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2012.10.017
关键词
Intermetallics; Ternary alloy system; Phase identification; Microstructure; Mechanical properties
资金
- Program for New Century Excellent Talents in Universities [NCET-06-0173]
- National Natural Sciences Foundation of PR China [51071009, 5071111]
- Aerospace [2010ZF51071]
This paper deals with phase constitutions, microstructural evolutions, and mechanical properties of Nb-16Si-xFe in-situ composites (where x = 2, 4, 6 at.%, referred as to 2Fe, 4Fe and 6Fe alloys, hereafter) prepared by arc-melting. It is found that with additions of Fe. Nb4FeSi silicide arises and microstructures of as-cast samples are consisted of dendritic-like Nb-SS phase, Nb3Si block, and Nb4FeSi matrix in the 2Fe and 4Fe alloys, and of the dendritic-like Nb-SS phase and Nb4FeSi matrix in the 6Fe alloy. When heat-treated at 1350 degrees C for 100 h, part of the Nb3Si phase decomposes in the 2Fe and 4Fe alloys, and the 6Fe alloy shows no change in microstructure as compared with the as-cast one. The Nb4FeSi suicide is found to be brittle, its fracture toughness and elastic modulus are first obtained, having values about 1.22 MPa m(1/2), and 310 GPa, respectively. The fracture toughness of the bulk as-cast and heat-treated Nb-16Si-xFe samples are changed slightly by the Fe additions, which is in a range of 9.03-10.19 MPa m(1/2). It is interesting that at room temperature, strength is improved by the Fe additions, whereas at 1250 degrees C and 1350 degrees C the strength decreases. As the Fe content increased from 2 at.% to 6 at.%, for example, the 0.2% yield strength increases from 1410 MPa to 1580 MPa at room temperature, decreases from 479 MPa to 385 MPa at 1250 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据