Measuring notch toughness of thin film metallic glasses using focused ion beam-based microcantilever method: Comparison with Ti and TiN crystalline films

作者：Li Chia Lin; Chu Jinn P; Lee Jyh Wei

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2017, 698: 104-109.

DOI：10.1016/j.msea.2017.05.002

• Metallic glass
• Thin film
• Notch toughness
• Microcantilever

This study measured the notch toughness of Zr- and W-based thin film metallic glasses (TFMGs), and compared the results with those data obtained from crystalline Ti and TiN thin films as well as bulk metallic glass (BMG). Deflection testing was conducted using microcantilevers fabricated by focused ion beam machining. The resulting load vs. deflection curves revealed that Zr-based TFMG, BMG, and Ti films exhibited non-linear curves after yielding, which represented the ductile deformation characteristics. Higher notch toughness values of 3.84 and 5.13 MPa root m for Zr- and W-based TFMGs, respectively, than TiN (2.15 MPa root m) and Ti (0.74 MPa root m) films were obtained. Thus, at micro-scales, metallic glasses present relatively better fracture behavior than do crystalline materials. This paper presents a direct comparison of works related to the notch toughness of amorphous and crystalline materials.

• 出版日期2017-6-20