(Zr50Cu35Ni6Al9)100-XScX非晶合金的晶化行為及顯微結構之研究

Study on Crystallization Behaviors and Microstructures of (Zr50Cu35Ni6Al9)100-XScX Amorphous Alloys

彭漢國(Han-guo Peng)

指導教授 ： 陳適範

國立臺北科技大學/工程學院/材料及資源工程系研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00262

摘要

本研究以單輥熔射旋淬法製備成份為(Zr50Cu35Ni6Al9)100-XScX(X=0，0.02，0.05，0.1，0.5及1at.%)之五元合金薄帶。其XRD繞射圖樣顯示，合金薄帶皆具有一寬廣繞射峰，且SEM-BSE圖中並無結晶相的析出，顯示其為非晶質結構。而合金薄帶的熱性質分析其ΔTx值位於80K至100K之間，表示其具有寬廣的過冷液態區且參數γ在X=0.5at.%時達到0.424，代表在此冷速下，此合金具有很好的玻璃形成能力。在機械性質方面，由微硬度試驗可以發現隨Sc添加量由0增加提升至1 at.%時，合金薄帶之硬度從598.57提升至674.18 Hv，且隨恆溫時間增加而上升，上升幅度約40至50%，顯示在退火過程裡，薄帶中陸續形成奈米晶。由XRD之結構分析顯示，經過恆溫退火後之薄帶，在結晶初期之薄帶結晶析出相為Cu10Zr7，隨恆溫時間增加，CuZr2、AlZr2、Al2Zr3、Ni2Zr及AlNiZr的結晶也陸續生成，同時可以估算其出結晶活化能，發現添加0.5 at.%的Sc時，結晶活化能約251KJ/mole，較無添加Sc之合金活化能211 KJ/mole高出約20%左右。

關鍵字

金屬玻璃 ； 非晶質合金 ； 玻璃形成能力機械性質 ； 熱處理

並列摘要

The multi-component alloy ribbons with compositions of (Zr50Cu35Ni6Al9)100-XScX (X=0，0.02，0.05，0.1，0.5及1at.%) were prepared by single roller melt-spinning method. Their thermal properties were measured by differential scanning calorimetry (DSC) and high-temperature differential scanning calorimetry (HTDSC) at a heating rate of 20K/min. The XRD spectra of (Zr50Cu35Ni6Al9)100-XScX(X=0,0.02,0.05, 0.1, 0.5, 1at.%) alloy ribbons consisted of only broad diffraction peaks without sharp Bragg peaks, indicating that they were amorphous. The ΔTx of these alloy ribbons ranged from 80 K to 100 K meaning, that they bear large supercooled liquid regions. The γ value at X=0.5at% reaches to 0.424 also indicating their great glass forming ability. The micro hardness measurements of alloy ribbons appeared to increase with Scandium additions in (from 598.57 to 674.18 Hv ). Furthermore, the ribbons’ hardness increased with isothermal annealing duration by 40 ~ 50%. It was observed that, the Cu10Zr7 crystals started to form at early stage of crystallization. The CuZr2 , AlZr2, Al2Zr3, Ni2Zr and AlNiZr crystallites were then precipitated in sequence. At X=0.5.%, the activation energy for crystallization was approximately 251 KJ/mole, increased by 20% in comparison with 211 KJ/mole without Sc addition.

並列關鍵字

Metallic glass ； Amorphous alloy ； Glass forming ability ； Mechanical properties ； Heat treatment

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