Study of the Fracture Behavior of Tetragonal Zirconia Polycrystal with a Modified Phase Field Model.
Study of the Fracture Behavior of Tetragonal Zirconia Polycrystal with a Modified Phase Field Model.
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修正相场模型研究四方氧化锆多晶断裂行为
DOI：
10.3390/ma13194430
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发表时间：
2020-10-05
期刊：
影响因子：
--
通讯作者：
Sun Y
中科院分区：
文献类型：
--
作者：
Zhu J;Luo J;Sun Y
氧化锆的上级断裂韧性与裂纹尖端附近的应力诱导马氏体相变密切相关。本文提出了一个耦合相变与断裂的修正相场模型，用于研究四氧化锆多晶（TZP）的断裂行为和增韧效果。应力诱导的四方晶系单斜（t-m）相变周围的静态或扩展裂纹的特征与PF模拟。结果表明，所提出的PF模型可以很好地预测不同载荷和环境温度下相变区的有限尺寸和形状。相变可以降低裂纹尖端附近的应力水平，这意味着韧化效应。在此基础上，研究了TZP中裂纹的扩展。由于应力场受到相变模式的扰动，裂纹在扩展过程中会发生偏转和分叉。结果表明，晶界韧性对裂纹扩展模式有重要影响。对于具有强晶界的TZP，裂纹更可能穿晶扩展，而对于具有弱晶界的TZP，沿晶裂纹扩展是普遍的。此外，晶体取向和外载荷也会影响裂纹扩展的拓扑结构。
The superior fracture toughness of zirconia is closely correlated with stress-induced martensitic phase transformation around a crack tip. In this study, a modified phase field (PF) model coupling phase transformation and fracture is proposed to study the fracture behavior and toughening effect of tetragonal zirconia polycrystal (TZP). The stress-induced tetragonal to monoclinic (t–m) phase transformation around a static or propagating crack is characterized with PF simulations. It is shown that the finite size and shape of the transformation zone under different loads and ambient temperatures can be well predicted with the proposed PF model. The phase transformation may decrease the stress level around the crack tip, which implies the toughening effect. After that, crack propagation in TZP is studied. As the stress field is perturbed by the phase transformation patterns, the crack may experience deflection and branching in the propagation process. It is found that the toughness of the grain boundaries (GBs) has important influences on the crack propagation mode. For TZP with strong GBs, the crack is more likely to propagate transgranularly while, for TZP with weak GBs, intergranular crack propagation is prevalent. Besides that, the crystal orientation and the external load can also influence the topology of crack propagation.
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影响因子：
2.5
作者：
Abdollahi, Amir;Arias, Irene
通讯作者：
Arias, Irene
DOI：
10.1111/j.1151-2916.1991.tb06800.x
发表时间：
1991-10-01
影响因子：
3.9
作者：
CHEN, IW
通讯作者：
CHEN, IW
DOI：
10.1111/j.1151-2916.1986.tb07403.x
发表时间：
1986-03-01
影响因子：
3.9
作者：
CHEN, IW;MOREL, PER
通讯作者：
MOREL, PER
DOI：
10.1016/j.jeurceramsoc.2004.07.029
发表时间：
2005-08-01
影响因子：
5.7
作者：
Deville, S;El Attaoui, H;Chevalier, M
通讯作者：
Chevalier, M
DOI：
10.1111/j.1151-2916.1992.tb07832.x
发表时间：
1992-03-01
影响因子：
3.9
作者：
BECHER, PF;SWAIN, MV
通讯作者：
SWAIN, MV