Investigation of Ultrasonic Properties of Hard Materials

• Main Authors: Chieh-ling Liu, 劉杰靈
• Other Authors: Shih-Jeh Wu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/75550215602433659785

碩士 === 義守大學 === 機械與自動化工程學系 === 102 === Investigation measure Young''s modulus of hard materials. ITO Gloss (Alkaline earth boro-aluminosilicate), Zr-Cu-Ag-Al ((Zr48Cu36Ag8Al8) Si0.75) metallic glass (Bulk metallic glass, BMG) and nickel-based superalloy (CM247LC) three materials, Comparison the measurement results between the ultrasound and nano-indenter. Then compare the relationship between ultrasound attenuation coefficient, Young''s modulus and Vickers hardness. The result of ITO glass Young''s modulus used ultrasound and nano-indenter to differences in the measured values were 0.83% and 2.70% and difference between the results of metallic glass is 23.59%, and 5.11% nickel-base superalloys. Measured of the longitudinal and shear wave velocity of the sample by the ultrasonic to calculate the material Poisson ratio and Young''s modulus would not have destroyed, While also quick and easy measurements on site. There nano-indenter test relative to the sample size restrictions on the amount cannot be measured on the spot, and the measurement process is relatively slowed time-consuming and susceptible to environmental interference. For intermetallic, material composition is a combination of metal and nonmetal. Its atomic arrangement direction and boundary effects have a considerable impact on the ultrasound velocity, Should be measurement and calculation of velocity in different propagation direction. Then compare the Young''s modulus of the nano-indentation test result. For nickel-based superalloy (CM247 LC) material, the grain growth direction as dendritic structure and has directionality, should be measurement and calculation of velocity in different propagation direction.