機械合金法合成三元及四元銅-鈦基非晶質合金之研究

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

楊上旗(Shang-Chi Yang)

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

本研究主要探討以機械合金法（Mechanical Alloying）合成銅基（Cu-based）合金粉末之非晶質化行為，再以XRD、SEM觀察粉末在機械合金過程中微觀組織的變化與相穩定性，用DSC熱分析儀來研究非晶質合金粉末在固定加熱速率下的熱穩定行為。幾種非晶質粉末在結晶反應發生前發現有寬廣過冷液態區DT的存在，其寬廣過冷液態區定義是在玻璃轉換溫度（Tg）與結晶化溫度（Tx）之間（DT＝Tx－Tg），Cu50Ti40Fe10為117.95 K、Cu50Ti35B15為77.62 K、Cu60Ti40Mg10為73.99 K、Cu55Ti40Sn5為91.82 K、Cu50Ti40Sn10為95.02 K、Cu60Ti35Sn5為81.13 K、Cu50Ti45Sn5為102.3 K、Cu50Ti40Sn9B1為103.25 K、Cu50Ti40Sn7B3為95.86 K、Cu50Ti40Sn5B5為110.88 K，故在Cu-Ti-Sn非晶質合金系統中添加微量的B元素可增進玻璃形成能力（GFA）。

關鍵字

機械合金 ； 非晶質相 ； 過冷液態區 ； 玻璃轉換 ； 銅基合金 ； 玻璃形成能力

並列摘要

This study examined the amorphization behavior of Cu-based alloy powders synthesized by mechanical alloying technique. The microstructural evolution during mechanical alloying of the mixed powders was investigated by both X-ray diffraction（XRD）and scanning electron microscopy（SEM）. The phase stabilities of the as-milled powders were analysed by the differential scanning calorimeter. Several amorphous powders were found to exhibit a wide supercooled liquid region before crystallization. The temperature interval of the supercooled liquid region defined by the difference between the glass transition temperature（Tg）and the crystalline temperature（Tx）, ie DT（DT＝Tx－Tg）, is 117.95 K for Cu50Ti40Fe10, 77.62 K for Cu50Ti35B15, 73.99 K for Cu60Ti40Mg10, 91.82 K for Cu55Ti40Sn5, 95.02 K for Cu50Ti40Sn10, 81.13 K for Cu60Ti35Sn5, 102.3 K for Cu50Ti45Sn5, 103.25 K for Cu50Ti40Sn9B1, 95.86 K for Cu50Ti40Sn7B3, and 110.88 K for Cu50Ti40Sn5B5. As the results demonstrated, small addition of B significantly improved the glass forming ability（GFA）of the Cu-Ti-Sn amorphous alloy.

並列關鍵字

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

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