機械合金法合成三元及四元鎂-銅基非晶質合金之研究

Synthesis of ternary and quaternary Mg-Cu-based amorphous alloys by mechanical alloying technique

陳則友(Tse-yu Chen)

指導教授 ： 胡家榮

大同大學/工程學院/材料工程學系所/碩士(2006年)

摘要

本研究主要以高能球磨機來進行機械合金法(Mechanical alloying)合成鎂-銅基(Mg-Cu-based)合金粉末，並探討其形成非晶質的可行性，在經過機械合金法處理十二小時後，利用XRD、SEM及DSC觀察粉末在機械合金過程中微觀組織的變化與熱穩定行為。幾種非晶質粉末在結晶有寬廣過冷液態區△T(△T=Tx-Tg)的存在，分別為，Mg40Cu40Ti20(55K)、Mg40Cu35Ti25(53K)、Mg40Cu35Ti23B2(51K)、Mg40Cu35Ti21Sn4(62K)和Mg40Cu35Ti21Ni5(74K)。故在Mg-Cu-Ti非晶質合金系統中添加微量的Sn及Ni元素可增進玻璃形成能力(Glass Forming ability,GFA)。

關鍵字

機械合金、非晶質相、過冷液態區、鎂-銅基合金、玻璃成形能力

並列摘要

This study examined the amorphization feasibility of Mg-Cu-based alloy powders synthesized by mechanical alloying technique with a high energy SPEX 8000-D ball mixer. The microstructural evolution and phase stabilities during mechanical alloying of the mixed powders were investigated by X-ray diffraction and scanning electron microscopy and differential scanning calorimeter. Several amorphous powders were found to exhibit a wide supercooled liquid region , ie ΔT(ΔT=Tx-Tg), is 55K for Mg40Cu40Ti20, 53K for Mg40Cu35Ti25, 51K for Mg40Cu35Ti23B2, 62K for Mg40Cu35Ti21Sn4, and 74K for Mg40Cu35Ti21Ni5. As the results demonstrated, small addition of Sn and Ni significantly improved the glass forming ability (GFA) of the Mg-Cu-Ti amorphous alloy.

並列關鍵字

Mechanical alloying ； Amorphous phase ； Supercooled liquid region ； Mg-Cu-based alloys ； GFA

參考文獻

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