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

戴鵬桓(Peng- Huan Tai)

指導教授 ： 陳適範

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00155

摘要

本研究將(Zr50Cu35Ni6Al9)100-XScX(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的合金棒材，在X=0.02與1 at.%時，其XRD繞射光譜呈現一寬廣繞射峰，且SEM-BSE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.%的合金棒材所測得ΔTx為105 K，高於先前學者發表的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.%非晶棒材的微硬度測試中，可以測得其硬度分別為575及580 Hv，高於其他成分之合金棒材；在單軸壓縮試驗方面，X=0.02 與1 at.%的非晶合金棒材所測得之壓縮強度分別為1750MPa及1800 MPa，為本研究合金系統中最高之強度，顯示以上兩個非晶結構之合金棒材具有優異的硬度與壓縮強度。由所有棒材的經單軸壓縮之破斷面分析，可以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，更可在脈絡狀圖樣之周圍，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)100-XScX(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 1 at.% Sc containing rod had ΔTx as high as 105 K showing its excellent glass forming ability. Among all alloys investigated, the alloy rods of X=0.02 and 1 at.% 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

參考文獻

[22]X. F. Zhang, Y. M. Wang, J. B. Qiang, Q. Wang, D. H.

Rossmann, Andreas Blatter, Alex Dommann, Peter J.

[39]S. Deledda, J. Eckert and L. Schultz, "Mechanically

[51]A. Gebert , J. Eckert and L. Schultz, "Effect of oxygen

J. Das, L. Schultz and M.D. Baro, "Fracture surface