微量Ce對Al-Y-Ni非晶合金晶化行為及顯微結構之研究

Study of Minor Ce on the Crystallization Behaviors and Microstructures of Al-Y-Ni Amorphous Alloys

林嘉宏(Chia-Hung Lin)

指導教授 ： 陳適範 ； 林於隆

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00411

摘要

本研究將(Al87Y8Ni5)100-xCex(x=0,1 at.%)以單輥旋淬法製作厚度約30~35 μm合金薄帶，XRD圖呈現寬廣繞射峰，且SEM圖也無結晶相產生，顯示其結構為非晶質。將合金薄帶冺用示差掃描熱分析儀(DSC)測定其熱性質，當x=1 at.%非晶薄帶於483.2 K出現玻璃轉換溫度(Tg)，過冷液態區(ΔTx)為41.3 K。非恆溫退火部分，當退火溫度為592K時x=0 at.% 非晶薄帶最高硬度值570.8 Hv，而x=1 at.%非晶薄帶最高硬度592.8 Hv其退火溫度為650 K。恆溫退火部分，恆溫30分鐘時x=0 at.% 非晶薄帶有最高硬度551.5 Hv，而恆溫80分鐘時x=1 at.%非晶薄帶有最高硬度602.2Hv。在退火過程中，因為奈米鋁晶在薄帶中析出，故有較高硬度值。XRD分析顯示，在非恆溫退火中，x=0 at.% 非晶薄帶晶化過程初期先析出α-Al，隨退火溫度提高Al3Y 、AlNi及無法冹定的介穩相陸續析出。x=1 at.% 非晶薄帶晶化過程初期先析出α-Al，隨退火溫度提高Al3Y、Al3Ce、AlCeNi、AlNi及無法冹定的介穩相也接續析出。在恆溫退火中， x=0,1 at.%非晶薄帶隨恆溫時間增加，其結晶相析出先後順序與非恆溫退火中的晶化過程相同。而從結晶活化能來看，當x=0 at.%時，結晶活化能為163 kJ/mol。而x=1 at.%時，結晶活化能為189 kJ/mol。因此添加微量Ce元素，可提高合金系統之熱穩定性。

關鍵字

金屬玻璃 ； 非晶質合金 ； 熱處理 ； 機械性質

並列摘要

The 30~35 μm thickness alloy ribbons of (Al87Y8Ni5)100-xCex(x=0,1 at.%) were produced by single roller melt-spinning method. The XRD spectra of (Al87Y8Ni5)100-xCex(x=0,1 at.%) alloy ribbons consisted of only broad diffraction peaks without any sharp Bragg peaks, and SEM-SE image has no crystallization shows, indicating they are amorphous in structure. The alloy ribbons by DSC measure the thermal properties, The (Al87Y8Ni5)99Ce1 alloy ribbons demonstrates a glass transition temperature (Tg)at 483.2 K, and its ΔTx is 41.3 K.
In non-isothermal the alloy ribbons of x=0 at.% has the highest microhardness of 570.8 Hv at the annealing temperature is 592 K. And the alloy ribbons of x=1 at.% has the highest microhardness of 592.8 Hv at the annealing temperature is 650 K. In isothermal the alloy ribbons of x=0 at.% has the highest microhardness of 551.5 Hv at the annealing time is 30 min. And the alloy ribbons of x=1 at.% has the highest microhardness of 602.2Hv at the annealing time is 80 min. In annealing process,
because in the ribbons of Al nanocrystalline precipitation, thereby increasing the microhardness.
In non-isothermal and isothermal annealing the alloy ribbons of x=0 at.%, the α-Al、Al3Y 、AlNi and unknow metastable phase were then precipitated in sequence. And the alloy ribbons of x=1 at.%, the α-Al、Al3Y、AlNi、Al3Ce、AlCeNi and unknow metastable phase were then precipitated in sequence.
At x=0 at.%, the activation energy for crystallization was 163 kJ/mol, x=1 at.%, the activation energy for crystallization was 189 kJ/mol. Therefore, addition of Ce element, can improve the thermal stability of the alloy.

並列關鍵字

Metallic glass ； Amorphous alloy ； Heat treatment ； Mechanical properties

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