R‐Curve Behavior of 3Y‐TZP at Cryogenic Temperatures
R‐Curve Behavior of 3Y‐TZP at Cryogenic Temperatures
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DOI：
10.1111/j.1551-2916.2011.04711.x
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发表时间：
2011-09
影响因子：
3.9
通讯作者：
Weijiang Xue;Z. Xie;Guanwei Liu;Wei Liu;Jian Yi
中科院分区：
文献类型：
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作者：
Weijiang Xue;Z. Xie;Guanwei Liu;Wei Liu;Jian Yi
我们首次报道了用 3 mol% Y2O3 (3Y-TZP) 稳定的氧化锆陶瓷在低温至 77 K 液氮温度下的 R 曲线行为，使用直接压痕法进行测量，并与断裂强度数据的威布尔统计分析一起进行分析。结果详细了解了温度降低对稳态断裂韧度 K 的影响，即只有相变增韧屏蔽项 ΔKT 的增加才对低温下的 K 值产生贡献，而本征断裂韧度 K 与温度无关。在低温下发现了传统解释未预料到的更明显的 R 曲线行为，这对于断裂强度和韧性的伴随增加具有重要意义。因此，相信3Y-TZP可能是低温结构应用中最有前途的材料之一。
We reported, for the first time, the R-curve behavior of zirconia ceramic stabilized with 3 mol% Y2O3 (3Y-TZP) at cryogenic temperatures down to liquid nitrogen temperature of 77 K, measured using direct indentation method and analyzed together with the Weibull statistical analysis of fracture strength data. The results provided a detailed understanding on the effect of decreasing temperature to the steady-state fracture toughness K∞ that only the increase in the transformation toughening shielding term ΔKT contributed to the K∞ value at cryogenic temperatures, whereas the intrinsic fracture toughness K0 is independent of temperature. A more pronounced R-curve behavior unanticipated by the conventional interpretation was found at cryogenic temperatures, which could be of great significance to the concomitant increment of the fracture strength and toughness. Therefore, it is believed that 3Y-TZP could be one of the most promising materials in cryogenic structural applications.