添加微量Sc對Zr-Cu-Al-Ni金屬玻璃的玻璃形成能力及機械性質之影響

Effects of Minor Scandium Additions on the Glass-Forming Ability and Mechanical Properties of Zr-Cu-Al-Ni Metallic Glass

謝政諭(Cheng-Yu Hsieh)

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(2009年)

摘要

由XRD繞射圖樣顯示，(Zr50Cu35Ni6Al9)100-XScX(X=0,0.02,0.05, 0.1, 0.5, 1at.%)合金薄帶與直徑4 mm的棒材在x=0.1,0.5,1 at%時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。X=0,0.02,0.05 at.%時，XRD繞射圖樣為一寬廣繞射峰上疊加特性繞射峰，意味著非晶質基地上有微小結晶結構的存在，直徑6mm的棒材僅在X=0.5 at%時，XRD繞射呈現寬廣繞射峰。急冷的合金薄帶其ΔTx值在123 K至130 K之間，表示其具有寬廣的過冷液態區且Trg值在X=0.5 at.%時達到0.562，代表在此冷速下此合金具有很好的玻璃形成能力。銅模鑄造的4mm棒材在X=0.5時ΔTx=88 K、Trg=0.630且6mm棒材在X=0.5時ΔTx=109 K、Trg=0.601。實驗結果顯示此Zr基合金在急速冷卻下易形成非晶質結構，而較慢的冷速下X=0.5at%具有最佳的金屬玻璃的形成能力。由維氏硬度試驗測出合金薄帶與直徑4mm在X=0.1,0.5,1at%金屬玻璃棒材Hv值隨Sc添加量而增加，Hv分別從513增至547、549提升至578 ；6mm的合金棒材在X=0.5 at.%時Hv=556。由單軸壓縮試驗測出直徑4mm金屬玻璃棒材在x=0.1,0.5,1 at.%時，壓縮強度隨Sc添加量的增加由1294 Mpa增至1683 Mpa，本實驗製成的金屬玻璃棒材都具有高硬度、高壓縮強度、高彈性應變、低彈性係數等特性。

關鍵字

金屬玻璃 ； 玻璃形成能力機械性質

並列摘要

The XRD pattern for (Zr50Cu35Ni6Al9)100-XScX(X=0,0.02,0.05, 0.1, 0.5, 1at.%) alloy ribbons and the rods (X=0.1, 0.5, 1at.%) with a diameter of 4mm consist of only broad diffraction maxima without any sharp Bragg peak, indicating that they are amorphous in structure. There are no contrast of crystalline phases in the samples, confirming that the rods (X=0.1, 0.5, 1at.%) with a diameter of 4mm in the SEM-BSE image. (X=0,0.02,0.05 at.%) are amorphous matrix and small crystalline phase. Only the rods at X=05 at.% is full amorphous. Alloy ribbons’ ΔTx from 123 K to 130 K, appear a large supercooled liquid region, and the value of Trg at X=0.5at% reaches to 0.562 represent great glass forming ability at the cooling rate. The rod( X= 0.5at.%) with a diameter of 4mm and its ΔTx and Trg is 88 K and 0.63 respectively, the rod with X= 0.5at.% are completely amorphous with a diameter of 6mm and its ΔTx and Trg is 109 K and 0.601 respectively. Experiment results show fabricating Zr-base alloy forms amorphous structure easily by the single roller melt-spinning, and (Zr50Cu35Ni6Al9)100-XScX with X=0.5 at.% is the best glass forming ability. Vickers hardness measurements appear the dependence of Vickers hardness(HV) on the Scandium additions for the alloy ribbons (from 513 to 547 ) and the rods (X=0.1, 0.5, 1 at.%) with a diameter of 4mm(from 549 to 578) , and Hv of alloy rod at X=0.5 at.% with a diameter of 6mm is 556, and The uniaxial compressive test results show the dependence of fracture strength on the Scandium additions for the rods (X=0.1, 0.5, 1 at.%) with a diameter of 4mm(from 1294 to 1683 MPa), and the alloy system represent great mechanical properties.

並列關鍵字

Metallic glass ； Glass forming ability ； Mechanical properties

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