離心鑄造法製作鋯鋁鎳銅合金薄板之非晶化研究

現代的鑄造方法中，離心鑄造法因為有很大的離心力，所以製出的鑄件可以獲得更緊密、更細緻的結構與可以做出相較於其他鑄造法更薄與更寬的斷面等優點。而Zr55Al10Ni5Cu30金屬玻璃合金具有良好的玻璃形成能力與過冷液態區高熱穩定性等特質，無論在液態凝固過程或是在結晶溫度以下加熱均不易析出結晶相。因此希望將上述的離心鑄造法優點與Zr55Al10Ni5Cu30金屬玻璃合金特質做結合，製備出較大體積的金屬玻璃。本研究是以離心銅模鑄造法製備Zr55Al10Ni5Cu30合金薄板，探討此鑄造方式是否能夠製作出體積較大的非晶質材料，並針對其微結構、玻璃形成能力、熱性質與機械性質進行研究。實驗中製備的Zr55Al10Ni5Cu30合金薄板，經由X光繞射分析結果，得知為寬廣繞射峰上疊加特性繞射峰，顯示其為非晶質基地上有微小結晶相析出的結構，經由系統的比對，其特性繞射峰為Ni7Zr2、Cu10Zr7與ZrAl等介金屬化合物。經由DSC掃描示差熱分析得知其結晶溫度(Tx)為486.8℃，過冷液態區(ΔTx)介於82.8℃至85.4℃之間，在最遠離冒口且最薄的試片其玻璃轉換溫度(Tg)為401.4℃、ΔTx為85.4℃，擁有最佳的玻璃形成能力。在機械性質方面，位在試片中央區域具有最高的硬度值，約為520.8Hv，是因結晶相的析出有利硬度提升，但是當網狀結構出現後硬度會開始下降，約為491.5Hv。

關鍵字

離心鑄造；金屬玻璃；玻璃形成能力；機械性質

並列摘要

In the modern casting methods, centrifugal casting because of it's larger centrifugal force could obtain closer finer structure, and be made wider and thinner cross-section than other casting methods. Zr55Al10Ni5Cu30 metallic glasses have good glass forming ability, high thermal stability of the supercooled liquid region and other characteristics. Therefore, we hope to combine these advantages and characteristics, make a larger volume of metallic glass. This study is prepared the sheet of Zr55Al10Ni5Cu30 alloy by centrifugal casting, discussion this casting method to make larger amorphous materials or not, and research its micro-structure, glass-forming ability, thermal properties and mechanical properties. The sheet of Zr55Al10Ni5Cu30 alloy by X-ray diffraction analysis shows that broad diffraction peaks with a few characteristic Bragg peaks, indicating the structure of specimen are amorphous base with a few precipitation of crystal phase. The result of XRD shows that crystallization in Zr55Al10Ni5Cu30 alloy include Ni7Zr2, Cu10Zr7 and ZrAl. By DSC measurements that first crystallization temperature (Tx) is 482 ℃, supercooled liquid region (ΔTx) is 85.4℃,the most far away from the riser and the thinnest specimen has the best glass forming ability with glass transition temperature (Tg) is 401.4℃, ΔTx is 85.4℃. In the test of mechanical properties, located in the central region of the specimen has the best Vickers hardness value, about 520.8 Hv, because of the precipitation of crystallization is good at enhance the hardness, but after the net-structure appeared, hardness begin to decrease, about 491.5Hv.

並列關鍵字

Centrifugal casting ； Metallic glass ； Glass forming ability ； Mechanical properties

參考文獻

[3] A. Inoue, "High Strength Bulk Amorphous Alloys with Low Critical Cooling Rates," Materials Transactions, JIM, vol.36, 1995, pp. 866-875.

[4] M. Chen, "Mechanical Behavior ofMetallic Glasses: Microscopic Understanding of Strength and Ductility," Annual Review of Material Research, vol.36, 2008, pp. 445-469.

[5] A. Inoue, T. Zhang and T. Masumoto, "Preparation of Bulky Amorphous Zr-Al- Co-Ni-Cu Alloys by Copper Mold Casting and Their Thermal and Mechanical Properties," Materials Transactions, JIM, vol.36, 1995, pp. 391-398.

[6] S. Pang, T. Zang, H. Kimura, K. Asami and A. Inoue, "Corrosion Behavior of Zr-(Nb-)Al-Ni-Cu Glassy Alloys," Materials Transactions, JIM, vol.41, 2000, pp. 1490-1494.

[7] T. C. Chieh, J. Chu, C. T. Liu and J. K. Wu, "Corrosion of Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glasses in aqueous solutions," Materials Letters, vol.57, 2003, pp. 3022-3025.

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離心鑄造法製作鋯鋁鎳銅合金薄板之非晶化研究

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