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首页> 外文期刊>Journal of Materials Research >Damage tolerance and R-curve behavior of Al_2O_3-ZrO_2-Nb multiphase composites with synergistic toughening mechanism
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Damage tolerance and R-curve behavior of Al_2O_3-ZrO_2-Nb multiphase composites with synergistic toughening mechanism

机译：协同增韧机制的Al_2O_3-ZrO_2-Nb多相复合材料的损伤容忍度和R曲线行为

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摘要

In the present work, the damage tolerance and R-curve behavior of alumina-zirconia-niobium multiphase composites were studied by the indentation strength method. A matrix of yttria-stabilized zirconia (3Y-TZP) strengthened with particles of Al_2O_3 (ATZ) and an alumina matrix strengthened with particles of 3Y-TZP (ZTA) were prepared by hot press of commercial powders, containing Nb metal particles as reinforcing phase. The crack growth behavior was analyzed, and it was found that stress-induced transformation toughening of ZrO_2 and bridging of the Nb inclusions were the two main factors that can shield an advancing crack and exert crack closure stresses on the crack wake. Moreover, on the basis of quantitative toughening analysis, it is argued that a synergistic effect originated from the interaction between the toughening mechanisms of Nb grains and zirconia, takes place in the alumina-zirconia-Nb multiphase composites. This showed that the combined toughening effect was bigger than the sum of the individual toughening effects when either reinforcement acted alone.
机译：通过压痕强度法研究了氧化铝-氧化锆-铌多相复合材料的损伤耐受性和R曲线行为。通过热压市售粉末，制备了以Al_2O_3（ATZ）颗粒增强的氧化钇稳定氧化锆（3Y-TZP）基质和以3Y-TZP（ZTA）颗粒增强的氧化铝基质，其中包含Nb金属颗粒作为增强相。分析了裂纹的扩展行为，发现应力诱导的ZrO_2相变增韧和Nb夹杂物的桥接是两个可以屏蔽前进裂纹并在裂纹尾流施加闭合应力的两个主要因素。此外，在定量增韧分析的基础上，认为在氧化铝-氧化锆-Nb多相复合材料中会产生Nb晶粒与氧化锆的增韧机理之间相互作用的协同效应。这表明，当任一补强物单独起作用时，组合的增韧作用大于单独的增韧作用的总和。

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