微量Sc對Zr-Cu-Al-Ni合金顯微結構及機械性質之影響

Effects of Minor Scandium on the Microstructures and Mechanical Properties of Zr-Cu-Al-Ni Amorphous Alloys

陳適範(Shih-Fan Chen) ； 林新亮(Chia-Hung Lin) ； 戴鵬桓(Peng-Huan Dai) ； 陳貞光(Jen-Kuang Chen) ； 林於隆(Yu-Lom Lin) ； 薄慧雲(Hui-Yun Bor)

《鑄造工程學刊》 37卷1期 (2011/03) Pp. 27-35

https://doi.org/10.29809/JTFS.201103.0004

摘要

本研究將(Zr50Cu35Ni6Al9)(下標 100-X)Sc(下標 X)（X=0, 0.02, 0.05, 0.1, 0.5,及1 at.%）以熔射鑄造法製備成直徑3mm的棒材，在X=0.02與1 at.%時，其XRD繞射光譜為一寬廣繞射峰，且SEM圖中未觀測到結晶相，顯示其為非晶質結構。X=0，0.05，0.1及0.5 at.%時，XRD繞射圖樣除了寬廣的繞射峰外，還增加許多特徵繞射峰意味著非晶質基地中微小結晶組織的存在。其中，含Sc 1 at.%的棒材其△Tx為105K，高於先前學者發表之Zr基材料研究，顯示此合金棒材具有良好的玻璃形成能力。由X=0.02與1 at.%非晶棒材的微硬度試驗中，可測得其硬度分別為575及580 Hv，優於其他成分之棒材；單軸壓縮試驗方面，X=0.02與1 at.%的非晶合金棒材其壓縮強度分別為1750MPa及1800MPa，為合金系統中最高之壓縮強度，以上顯示非晶結構之合金棒材具有優異的硬度與壓縮強度。破斷面分析方面，所有棒材皆可觀察到非晶特有之脈絡狀破斷面形貌，經進一步倍率放大後，可觀察到屬脆性破裂的河川紋特徵。

關鍵字

金屬玻璃 ； 機械性質 ； 破斷面形貌

並列摘要

The 3mm diameter alloy rods of (Zr50Cu35Ni6Al9)(subscript 100-X)Sc(subscript X) (X=0, 0.02, 0.05, 0.1, 0.5 and 1at.%) were produced by injection casting method. In the rods where Sc addition were 0.02 and 1 at.%, their XRD spectra consisted of only broad diffraction peaks without any sharp Bragg peaks, indicating they are amorphous in structure. For the rods of X=0, 0.05, 0.1 and 0.5 at.%, their XRD spectra showed characteristic Bragg peaks on top of the broad diffraction peaks meaning that they were glassy matrix composites. The 1at.% Sc containing rod had △Tx as high as 105 K showing its excellent glass forming ability. Among all alloys investigated, the alloy rods of X=0.02 and 1at.% gave rise to the highest microhardness of 575 and 580 Hv respectively. Their uniaxial compressive strengths were also the highest and reached 1750MPa and 1800MPa respectively. The vein-like fracture characteristics were found to dominate the fracture surfaces of all uniaxial compressive test specimens. However, in the regions nearby these vein-like fractures, typical brittle river patterns were also observed.

並列關鍵字

Metallic glass ； Mechanical properties ； Fractography