| 从液态锡的电阻率研究其结构变化的滞后性 |
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| 引用本文： | 常芳娥,李卫军,吕士勇,杨晓琴,坚增运.从液态锡的电阻率研究其结构变化的滞后性[J].西安工业大学学报,2010,30(2):155-159. |
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| 作者姓名： | 常芳娥 李卫军 吕士勇 杨晓琴 坚增运 |
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| 作者单位： | 西安工业大学,材料与化工学院,西安,710032 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展规划(973计划) |
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| 摘 要： | 采用基于四电极法的电阻动态测量系统,对过热和过冷液态锡在加热、冷却和保温过程中电阻率的变化规律进行了动态测定.结果表明,液态锡的电阻率先随熔体快速加热后保温时间的延长而减小、随熔体快速冷却后保温时间的延长而增大,保温时间达到7~15分钟后趋于稳定.升温速度对液态锡的电阻率有明显影响,快速升温熔体的电阻率明显大于慢速升温熔体在同一温度下的电阻率.过冷液态锡的电阻率变化规律与温度高于熔点液态锡的相同.研究结果表明,液态金属的结构变化存在滞后性和传承性.温度变化后,液态金属的结构不能随温度同步达到其在对应温度下的平衡状态.
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| 关 键 词： | 锡 电阻率 熔体结构 滞后性 四电极法 |
Study on the Hysteresis of Melt Structure Variation from the Resistivity of Liquid Tin |
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| Authors: | CHANG Fang-e LI Wei-jun LV Shi-yong YANG Xiao-qin JIAN Zeng-yun |
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| Affiliation: | CHANG Fang-e,LI Wei-jun,LV Shi-yong,YANG Xiao-qin,JIAN Zeng-yun(School of Materials , Chemical Engineering,Xi\'an Technological University,Xi\'an 710032,China) |
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| Abstract: | By using a dynamic test system based on four-point probe method for measuring resistance,the resistivities of liquid tin superheated and undercooled during heating process,cooling process and holding process have been measured.It is found that the resistivity of liquid tin first decreases with increasing the holding time after a rapid heating process,and then increases after a rapid cooling process and tends towards stability when the holding time is 7~15 min.The heating rate influences the resistivity of l... |
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| Keywords: | tin resistivity melt structure hysteresis four electrode method |
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