硬值材料超音波特性之探討

本論文探討硬質材料楊氏係數量測方法，針對ITO玻璃(Alkaline earth boro-aluminosilicate)、金屬玻璃(Bulk metallic glass, BMG)及鎳基超合金(CM247LC)三種材料使用超音波及奈米壓痕來作為楊氏系數量測結果的比較，同時比對三種材質間的超音波衰減係數、楊氏系數及維克氏硬度三者間的關係。 ITO玻璃(Alkaline earth boro-aluminosilicate)用超音波量測到的楊氏系數結果與用奈米壓痕所量測到的結果差異值分別在0.83%及2.70%間，金屬玻璃的結果差異值為23.59%以及鎳基超合金的5.11%。且超音波用量測縱波及橫波波速去計算材料浦松比及楊氏係數對於實際樣品並不會有破壞的行為，同時亦可在現場量測快速簡便。相對於奈米壓痕就有試驗樣品大小上的限制，無法在現場即時量測，且其量測過程較為緩慢耗時及易受環境干擾。對於金屬玻璃(Bulk metallic glass, BMG)而言，材料成份為金屬與非金屬組合而成，其原子排列方向及熔合金屬和非晶合金之間的界面生成物對超音波的波速據有相當的影響，應對其不同的傳遞方向進行波速的量測與計算。再和奈米壓痕試驗得到的楊氏係數結果做比較。對於鎳基的超合金金屬(CM247 LC)材質而言，其晶粒成長方向如樹枝狀結構且具有成長方向性，超音波量測時也應對不同的傳遞方向進行波速的量測與計算。

關鍵字

超音波；奈米壓痕；楊氏系數；衰減系數；維克氏硬度；金屬玻璃；鎳基超合金

並列摘要

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.

並列關鍵字

Ultrasound ； Nano-Indenter ； Ultrasonic attenuationcoefficient ； Vickers hardness ； intermetallic ； nickel-based superalloy

參考文獻

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硬值材料超音波特性之探討

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