期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 806, 期 -, 页码 841-851出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.07.201
关键词
Aluminium flake powder; Syntactic aluminium foam; In situ nitridation; Aluminium nitride dendrites; Porous AlN Al2O3 compounds
In situ nitridation of pre-compacted aluminium flakes is shown to be a key to lightweight composites for many engineering applications such as more efficient and cost-effective construction vehicles. This new composite has the mechanical properties of high-strength streels while being similar to 3.4 times lighter. This composite was produced by: (i) compaction of micrometric Al flakes into porous blanks, (ii) partial melting through rapid heating to 870 K in N-2 and (iii) annealing of the pre-melted blanks at 750 K in N-2, where different Al flake deoxidisers were used to control a sufficiently low level of H2O/O-2 activating in situ nitridation. The nitrided composites contained stellar dendrites composed of Al, AlN and gamma-Al2O3, in which the ceramic fraction increases over the nitridation stage. The traces of H2O in the N-2 atmosphere were found to be beneficial for strengthening, due to oxidation and suppression of the composite dendrites from overgrowing and segregation. (C) 2019 Elsevier B.V. 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