Title

微量Sc對Zr-Cu-Al-Ni合金顯微結構及機械性質之影響

Translated Titles

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

DOI

10.6841/NTUT.2010.00155

Authors

戴鵬桓

Key Words

金屬玻璃 ; 機械性質 ; 破斷面形貌 ; Metallic glass ; Mechanical properties ; Fractography

PublicationName

臺北科技大學材料科學與工程研究所學位論文

Volume or Term/Year and Month of Publication

2010年

Academic Degree Category

碩士

Advisor

陳適範

Content Language

繁體中文

Chinese Abstract

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。

English Abstract

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.

Topic Category 工程學院 > 材料科學與工程研究所
工程學 > 工程學總論
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