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B、N小原子對Dy(Gd)基合金非晶形成能力和晶化動力學(xué)的影響
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國家自然科學(xué)基金（50571054）


Effect of Small Atoms of B and N on Glass-Forming Ability and Crystallization Kinetics of Dy(Gd)-Based Alloys
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    摘要:

    采用水冷銅模吸鑄法制備添加B、N小原子的Dy(Gd)基合金系樣品，利用X射線衍射（XRD）儀檢測合金的相結(jié)構(gòu)，利用示差掃描量熱（DSC）儀研究合金的玻璃轉(zhuǎn)變和晶化行為，用Kissinger和Arrehenius方程分別計算出合金的晶化激活能、頻率因子、晶化速率常數(shù)等晶化動力學(xué)參數(shù)。結(jié)果表明：Dy31Gd25Co20Al24合金中添加小原子B和N，晶化模式發(fā)生改變；合金的過冷液相區(qū)和晶化激活能先減小后增大；加入B原子，合金的晶化速率常數(shù)先增大后減小，加入N原子，合金的晶化速率常數(shù)先減小后增大。

    Abstract:

    A series of Dy(Gd)-based bulk metallic glasses with small atoms of B and N were prepared by casting the melt ingots into a water-cooled copper mould. Their phase structure was analyzed by X-ray diffraction. The glass transition and crystallization behavior were measured by differential scanning calorimetry (DSC). Kinetics parameters of crystallization such as crystallization activation energy, frequency factor and crystallization rate constant were calculated by Kissinger equation and Arrehenius law. The results show that for the Dy31Gd25Co20Al24 alloy with addition of small atoms of B and N, the crystallization model changed; both the supercooled liquid region and crystallization activation energy were first decreased and then increased; with added B atom, crystallization rate constant of the alloy was first increased and then decreased; while with added N atom, crystallization rate constant was first decreased and then increased.

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田 瑞,羅 林,丁鐵鎖,肖學(xué)山. B、N小原子對Dy(Gd)基合金非晶形成能力和晶化動力學(xué)的影響[J].稀有金屬材料與工程,2010,39(5):862~866.[Tian Rui, Luo Lin, Ding Tiesuo, Xiao Xueshan. Effect of Small Atoms of B and N on Glass-Forming Ability and Crystallization Kinetics of Dy(Gd)-Based Alloys[J]. Rare Metal Materials and Engineering,2010,39(5):862~866.]
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  • 收稿日期:2009-07-05
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