| 块体非晶合金（Fe0．5Co0．5）72B19．2Si4．8Nb4的晶化动力学效应 |
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| 引用本文： | 任燕萍,杨元政,董振江,林龙心,陈先朝,谢致薇.块体非晶合金（Fe0．5Co0．5）72B19．2Si4．8Nb4的晶化动力学效应[J].喀什师范学院学报,2008,29(3):31-34. |
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| 作者姓名： | 任燕萍 杨元政 董振江 林龙心 陈先朝 谢致薇 |
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| 作者单位： | 广东工业大学,材料与能源学院,广州,510006 |
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| 基金项目： | 国家自然科学基金，广东省自然科学基金 |
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| 摘 要： | 利用较低纯度的原材料通过真空铜模吸铸法成功地制备了直径为2mm的（Fe0．5Co0．5）72B19．2Si4．8Nb4块体非晶合金。用X射线衍射（XRD）和示差扫描量热分析仪（DSC）研究了该非晶合金的晶化行为。结果表明，升温速率为10℃／min时，玻璃转变温度Tg为568．3℃，晶化起始温度Tx为598．6℃，晶化峰值温度Tp为608．0℃．随着升温速率的增加，特征温度Tg，Tx，Tp向高温区移动．用Kissinger法得到的玻璃转变激活能E。为272．3KJ／mo｜，晶化激活能E：为386．2KJ／too｜，晶化峰值激活能Ep为401．9KJ／mol,用Ozawa法得到的特征温度激活能与用Kissinger法得出的激活能变化趋势是一致的，都有Ep〉Ex〉Eg 此外，用Ozawa法分析了晶化激活能随晶化体积分数的关系，表明随着晶化体积分数的逐渐增加，激活能先增加，当晶化体积分数为14％时，激活能达到最大值379．4KJ／mol，然后随着晶化体积分数的逐渐增加，激活能减少。
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| 关 键 词： | FeCo-基块体非晶合金 真空铜模吸铸法 晶化行为 晶化激活能 |
| 文章编号： | 1006-432X(2008)03-0031-04 |
| 修稿时间： | 2008年4月19日 |
Crystalization Behavior of (Fe0.5Co0.5)72B19.2Si4.8Nb4 Bulk Metallic Glass |
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| REN Yan-ping,YANG Yuan-zheng,DONG Zhen-jiang,LIN Long-xin,Chen Xiao-chao,XIE Zhi-wei.Crystalization Behavior of (Fe0.5Co0.5)72B19.2Si4.8Nb4 Bulk Metallic Glass[J].Journal of Kashgar Teachers College,2008,29(3):31-34. |
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| Authors: | REN Yan-ping YANG Yuan-zheng DONG Zhen-jiang LIN Long-xin Chen Xiao-chao XIE Zhi-wei |
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| Institution: | (Faculty of Material and Energy, Guangdong University of Technology, Guangzhou 510006) |
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| Abstract: | The （Fe0.5Co0.5） 72B19.2Si4.8Nb4 bulk amorphous alloy rods with maximum diameter of 2 mm thick were prepared by copper-mold vacuum suction casting through the raw materials of low purity. X-ray diffraction （XRD） and differential scanning calorimetry （DSC） were used to study the crystallization behavior the amorphous alloy. At a heating rate of 10℃/min, the glass transition temperature （ Tg）, crystallization temperature （Tx） and peak temperature of （Tp） was 568.3℃ , 598.6℃ and 608.0℃ , respectively. As the heating rate increased, Tg, Tx and Tp of the amorphous alloy shifted to a higher temperature area. The activation energy corresponding to the charactarstic temperatures, which calculated by Kissinger method, Eg was 272.3 KJ/mol, Ex was 386.2KJ/mol, Ep was 401.9 KJ/mol, respectively. And results derived from Ozawa method showed similar to those of Kissinger method, showing Ep 〉 Ex 〉 Eg. Besides, the dependence of the activation energy on crystallization fraction was analyzed by mean of Ozawa method and the results showed that at the beginning the activation energy, Eg of crystallization increased with crystallization fraction, α, and reached the maximum 379.4 KJ/mol at a = 14% , then, Eg apparently decreased with the crystallization fraction. |
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| Keywords: | Fe-Co-based bulk amorphous alloy Copper-mold vacuum suction casting Crystallization behavior Activation energy of crystallization |
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