Content of research

The hardness test, a method to clarify the strength of materials from the deformation caused by local loading, is widely used based on its high simplicity and reproducibility. To obtain highly accurate stress response information while taking advantage of the simplicity of this method, we have developed in-situ hardness tests (micro-indentation) method.
To observe the surface of the specimen both inside and around the indentation through a transparent indenter during the indentation test, it is necessary to optimize the optical conditions. However, by introducing a liquid with a refractive index close to that of the transparent indenter around the indenter, we have enabled a wide range of surface observations.

Potential for social implementation

• ・Clarification and screening of pseudo-plastic deformation behavior of superelastic NiTi alloy by Brinell indenter.
• ・Introduction of deformation twinning in magnesium alloys around a Brinell indenter.
• ・Direct observation of the crack propagation process with a Vickers indenter.

Appealing points to industry and local governments

This invention is a simple system that can be used not only for basic research but also for product management. It is the result of our joint research with AIST, Tokyo Institute of Technology and Hirosaki University. For inquiries, please contact the Institute for the Promotion of Business-Regional Collaboration.