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《Material Science and Technology》 2004-04
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Microstructures and fracture of nano-micron bulk multiphase ceramics fabricated by the SHS metallurgical process

ZHAO Zhong-min~1, ZHANG Long~1, WANG Jian-jiang~(1,2), YIN Yu-jun~1,LI Jun-shou~1(1.Institute of Advanced Materials, Ordnance Engineering College, Shijiazhuang 050003, China,;2.College of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China)  
By adding ZrO_2(2Y) powder of certain content into (CrO_3+Al) combustion system, bulk nano-micron structured multiphase ceramics of Al_2O_3-35vol%ZrO_2 was obtained in one quick step through the SHS metallurgical process, and mirostructures and fracture behaviors of the multiphase ceramics were also investigated. Experimental results showed that the ceramics was mainly composed of the eutecticums of intro-granular structures with nano-micron ZrO_2 fibers, Vickers indentation tests indicated that the critical value of indentation load which induced crack of the ceramics to extend was 30kg, and XRD quantitative analyses demonstrated stress inducedtransformation toughening mechanism and micro-crack toughening mechanism owned by ZrO_2phases were executed very poorly. SEM observation showed crack extension was mainly controlled by the eutecticums of intro-granular structures with nano-micron ZrO_2 phases, resulting in existence of strong toughening mechanism due to crack deflection during fracture process of the ceramics.
【Fund】: 国家自然科学基金资助项目(59972043);; 军械工程学院科研基金资助项目(YJJXM02013).
【CateGory Index】: TB39;TB383
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