Fabrication of a PSZ-Ti functionally graded material by spark plasma sintering and its fracture toughness
Fabrication of a PSZ-Ti functionally graded material by spark plasma sintering and its fracture toughness
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DOI：
10.1016/j.msea.2016.11.091
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发表时间：
2017-01
期刊：
影响因子：
6.4
通讯作者：
T. Fujii;K. Tohgo;H. Isono;Y. Shimamura
中科院分区：
文献类型：
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作者：
T. Fujii;K. Tohgo;H. Isono;Y. Shimamura
研究了放电等离子烧结（SPS）制备的部分稳定氧化锆（PSZ）-纯钛（Ti）功能梯度材料（FGM）的断裂行为。制备了PSZ含量从PSZ表面到Ti基体逐步减少的PSZ-Ti功能梯度材料，并对其断裂韧性分布进行了评价。在梯度层中没有观察到大的空洞和分层。Ti基体和PSZ表面分别保持了SPS制备的整体Ti和PSZ的原始硬度，梯度层中的硬度随着Ti体积分数的增加而降低。在断裂韧性测试中，从PSZ表面中的小起始裂纹通过梯度层发生不稳定的裂纹扩展，并且在Ti基体中发生稳定的裂纹扩展。随着远离梯度层与基体的界面，基体的断裂韧性增加。这些结果表明，PSZ-Ti功能梯度材料具有阻止裂纹在Ti基体中扩展的能力。
This paper deals with fracture behavior of a partially stabilized zirconia (PSZ) - pure titanium (Ti) functionally graded material (FGM) fabricated by spark plasma sintering (SPS) technique. The PSZ-Ti FGM in which PSZ content is reduced from PSZ surface to Ti substrate in a stepwise manner was fabricated, and its fracture toughness distribution was evaluated. Large voids and delamination were not observed in the graded layer of the fabricated FGM. The Ti substrate and PSZ surface maintained original hardness of the monolithic Ti and PSZ fabricated by SPS respectively, and the hardness in the graded layer decreased with increasing Ti volume fraction. In fracture toughness tests, unstable crack growth occurred from a small starter-crack in the PSZ surface through the graded layer and stable crack growth occurred in the Ti substrate. The fracture toughness in the Ti substrate increased with being apart from the interface between the graded layer and Ti substrate. These results revealed that the PSZ-Ti FGM had an ability to arrest crack propagation in the Ti substrate.