Damage evolution and domain-level anisotropy in metal/ceramic composites exhibiting lamellar microstructures
Damage evolution and domain-level anisotropy in metal/ceramic composites exhibiting lamellar microstructures
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DOI：
10.1016/j.actamat.2009.12.015
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发表时间：
2010-04-01
期刊：
影响因子：
9.4
通讯作者：
Wanner, Alexander
中科院分区：
文献类型：
--
作者：
Roy, Siddhartha;Butz, Benjamin;Wanner, Alexander
研究了基于陶瓷预制体的铝/氧化铝复合材料。观察到由交替但互穿的陶瓷和金属薄片组成的畴。从不同条件下处理的复合材料中提取单畴样品。原位扫描电子显微镜分析进行了研究压缩载荷下的损伤演化。当沿平行于凝固方向的沿着方向加载时，复合材料是强而脆的。当在其他方向上压缩时，其行为由软金属控制。的塑性各向异性是不太明显的理论预测层压板，这是解释的陶瓷层压板之间的桥梁的存在。在熔融渗透之前用Cu或Cu 2 O涂覆预成型件降低了复合材料的压缩强度。透射电子显微镜分析表明，即使在Cu涂层的情况下，在加工过程中也会形成Cu 2 O层，从而削弱界面并防止Cu在铝合金中的溶解。(C)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Aluminium/alumina composites based on ceramic preforms prepared via freeze-casting are examined. Domains composed of alternating but also interpenetrating ceramic and metallic lamellae are observed. Single-domain samples were extracted from composites processed under different conditions. In situ scanning electron microscopy analyses were carried out to investigate the damage evolution under compressive load. The composite is strong and brittle when loaded along directions parallel to the freezing direction. When compressed in other directions, the behavior is controlled by the soft metal. The plastic anisotropy is less pronounced than theoretical predictions for laminates, which is explained by the presence of bridges between the ceramic lamellae. Coating the preform with Cu or Cu2O prior to melt infiltration reduces the compressive strengths of the composites. Transmission electron microscopy analysis shows that even in the case of a Cu coating a Cu2O layer is formed during processing, weakening the interface and preventing the dissolution of Cu in the aluminium alloy. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.