Fabrication of a PSZ-Ti functionally graded material by spark plasma sintering and its fracture toughness

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• 作者：Tomoyuki Fujii ; ^{fujii.tomoyuki@shizuoka.ac.jp} ; Keiichiro Tohgo ; Hiroshi Isono ; Yoshinobu Shimamura
• 关键词：Powder metallurgy ; Spark plasma sintering ; Functionally graded materials ; Fracture toughness
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：656-663
• 全文大小：2125 K
• 卷排序：682

文摘

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.