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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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激光悬浮区熔定向凝固Al2O3/YAG/ZrO2三元过共晶合金的微观组织
DOI: 10.3724/SP.J.1037.2011.00594, PP. 220-226
Keywords: Al2O3/YAG/ZrO2？,过共晶,固/液界面,组织
Abstract:
利用自行研制的激光悬浮区熔设备制备了Al2O3/YAG/ZrO2三元过共晶自生复合材料.在过共晶成分下获得了不含初生相的全共晶层片状组织.详细分析了固/液界面形貌形成原因,并由界面形貌出发阐述了Al2O3/YAG/ZrO2三元过共晶组织织构化趋势.结果表明,低凝固速率下,三元过共晶成分下层片间距大于三元共晶成分下层片间距,而在高凝固速率下则相反,这主要是由于ZrO2的加入影响了体系的传热及传质条件,通过经典非规则共晶模型综合分析了传输条件对层片间距的影响.过共晶平均层片间距(λav)与凝固速率(V)满足λavV0.5=14.7μm1.5s-0.5,符合JH模型.对于激光加工中经常出现的带状组织形成机理也进行了讨论.
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