| 引用本文: | 郭金花,连法增,倪晓俊,刘辉,李德仁,卢志超.Fe45Co7Cr15Mo10Y2B6C15大块非晶合金的晶化动力学研究[J].材料科学与工艺,2012,20(3):113-116.DOI:10.11951/j.issn.1005-0299.20120322. |
| GUO Jin-hua,LIAN Fa-zeng,NI Xiao-jun,LIU Hui,LI De-ren,LU Zhi-chao.Crystallization kinetics of Fe45Co7Cr15Mo10Y2B6C15 bulk amorphous alloy[J].Materials Science and Technology,2012,20(3):113-116.DOI:10.11951/j.issn.1005-0299.20120322. |
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| 摘要: |
| 为了明确Fe基块体非晶材料的晶化过程，通过铜模吸铸法制备了Fe45Co7Cr15Mo10Y2B6C15块体非晶合金，采用连续和等温差热扫描量热法对非晶合金在1 000 K以下的晶化动力过程进行了研究.研究表明：在973 K时效后的晶化产物为铁的碳化物；晶化过程的激活能达到了555.9 kJ/mol，非晶热稳定性良好；Avrami常数n值接近2，随着退火温度的变化，n值没有明显的变化，非晶晶化机理没有发生改变，而放热峰宽随着退火温度的降低明显宽化，说明非晶晶化过程是一个二维扩散控制的形核与长大过程. |
| 关键词: 铁基非晶合金 晶化行为 动力学 激活能 扩散 |
| DOI：10.11951/j.issn.1005-0299.20120322 |
| 分类号:O751 |
| 基金项目:国家自然科学基金资助项目（51071050） |
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| Crystallization kinetics of Fe45Co7Cr15Mo10Y2B6C15 bulk amorphous alloy |
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GUO Jin-hua1,2,3, LIAN Fa-zeng1,2,3, NI Xiao-jun1,2,3, LIU Hui1,2,3, LI De-ren1,2,3, LU Zhi-chao1,2,3
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1.China Iron &2.Steel Research Institute Group,Advanced Technology &3.Materials Co.Ltd,Beijing 100081,China
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| Abstract: |
| To clarify the crystallization properties of Fe-based bulk amorphous alloy,this paper studied the crystallization kinetics of Fe45Co7Cr15Mo10Y2B6C15 bulk amorphous alloy prepared by copper-mold casting in the mode of continuous heating and isothermal annealing by differential scanning calorimetry(DSC)at 1 000 K.The results show that the crystalline phase is cementite after annealling at 973 K.The crystallization process with activation energy of 555.9 kJ/mol indicates that the amorphous alloy has good stability.Avrami n is close to 2 and changes little with the increasing of annealing temperature,which indicates that the crystallization mechanism doesn’t change.The exothermic peak width increases when the annealing temperature decreases.Amorphous-to-crystallization transformation is a nucleation and growth process controlled by two-dimensional diffusion. |
| Key words: Fe-based amorphous alloy crystallization kinetics activation energy diffusion |
