Achieving room temperature plasticity in brittle ceramics through elevated temperature preloading

Author:

Shen Chao1ORCID,Li Jin12,Niu Tongjun1ORCID,Cho Jaehun13,Shang Zhongxia1ORCID,Zhang Yifan1,Shang Anyu1ORCID,Yang Bo1,Xu Ke1,García R. Edwin1ORCID,Wang Haiyan14ORCID,Zhang Xinghang1ORCID

Affiliation:

1. School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.

2. Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.

3. School of Materials Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, Republic of Korea.

4. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.

Abstract

Ceramic materials with high strength and chemical inertness are widely used as engineering materials. However, the brittle nature limits their applications as fracture occurs before the onset of plastic yielding. There has been limited success despite extensive efforts to enhance the deformability of ceramics. Here we report a method for enhancing the room temperature plastic deformability of ceramics by artificially introducing abundant defects into the materials via preloading at elevated temperatures. After the preloading treatment, single crystal (SC) TiO 2 exhibited a substantial increase in deformability, achieving 10% strain at room temperature. SC α-Al 2 O 3 also showed plastic deformability, 6 to 7.5% strain, by using the preloading strategy. These preinjected defects enabled the plastic deformation process of the ceramics at room temperature. These findings suggest a great potential for defect engineering in achieving plasticity in ceramics at room temperature.

Publisher

American Association for the Advancement of Science (AAAS)

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