| 氧对Zr50Cu40Al10块体金属玻璃晶化动力学的影响 |
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| 引用本文： | 张敬,贺林,孙军.氧对Zr50Cu40Al10块体金属玻璃晶化动力学的影响[J].西安交通大学学报,2005,39(11):1223-1226. |
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| 作者姓名： | 张敬 贺林 孙军 |
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| 作者单位： | 西安交通大学金属材料强度国家重点实验室,710049,西安 |
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| 摘 要： | 利用不同锆原材料、采用电弧炉坩埚倾斜铸造法制备了具有不同氧含量的Zr50Cu40Al10三元锆基块体金属玻璃,研究了氧对合金热稳定性及晶化动力学的影响.研究结果表明:合金的热稳定性随其氧含量的增加而降低,但晶化表观激活能却随氧含量的增加而增加;氧是通过提高晶化反应速率常数而降低合金热稳定性的,热稳定性与反应速率常数之间存在良好的对应关系,反应速率常数可以较好地表征具有强烈动力学效应的块体金属玻璃晶化过程;氧提高合金晶化反应速率常数的原因是由于它增大了反应的频率因子.
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| 关 键 词： | 块体金属玻璃 热稳定性 激活能 晶化反应 |
| 文章编号： | 0253-987X(2005)11-1223-04 |
| 收稿时间： | 04 5 2005 12:00AM |
| 修稿时间： | 2005年4月5日 |
Effect of Oxygen on Crystallization Kinetics of Zr50Cu40Al10 Bulk Metallic Glass |
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| Zhang Jing,He Lin,Sun Jun.Effect of Oxygen on Crystallization Kinetics of Zr50Cu40Al10 Bulk Metallic Glass[J].Journal of Xi'an Jiaotong University,2005,39(11):1223-1226. |
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| Authors: | Zhang Jing He Lin Sun Jun |
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| Abstract: | Ternary Zr_(50)Cu_(40)Al_(10) bulk metallic glass(BMG) with different oxygen contents was fabricated by tilt casting method adopting ladle-hearth-type arc furnace for different raw zirconium materials.The effects of oxygen on the thermal stability and the crystallization kinetics of the ternary alloy were investigated.It is shown that the thermal stability of the alloy is seriously decreased and the crystallization apparent activation energy clearly increased with increasing oxygen concentration during this process.Oxygen reduces the thermal stability of the alloy by raising the crystallization reaction constant.An expected corresponding relationship between the thermal stability of the alloy and the crystallization reaction constant is demonstrated.Crystallization reaction constant perfectly characterizes BMG crystallization process with a strong kinetic effect. |
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| Keywords: | bulk metallic glass thermal stability activation energy crystallization reaction |
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