脉冲电场作用下纯铝熔体的遗传机制  

Hereditary mechanism of aluminum melt under the action of pulse electric field

作　　者：齐锦刚[1] 王建中[2] 刘兴江[1] 刘铁铮[2] 苍大强[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]辽宁工学院材料系,辽宁锦州121001

出　　处：《材料热处理学报》2006年第1期36-39,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50174028);辽宁省自然科学基金(001080)

摘　　要：对处于熔点以上的纯铝施加电脉冲,通过对铝锭的多次重熔实验,研究了其熔体结构的遗传性。结果表明电脉冲孕育处理对试样凝固组织具有明显细化效果;基于该条件下熔体遗传规律的特异性,提出了一种按晶粒度度量的遗传判据。计算指出子一代遗传效应显著,其遗传信息保持率在80%以上;另一方面,遗传系数与脉冲电压直接相关,其衰减规律符合In=1+e-αn+β方程。差热分析实验揭示了脉冲场下熔体结构的变异性,一定程度上验证了遗传载体团簇在子代间的传递。The heredity of pure aluminum melt under the action of pulse electric field was investigated by means of repetitious remelt experiment.The results indicate Electric Pulse Modification(EPM)offers an obvious effect of grain refining on solidfied structure of samples.The definition of hereditary criterion is given by measurement of grain size based on the particularity of hereditary laws in this condition.The first generation samples get remarkable heredity by calculation,whose retaining rate of genetic information is above 80%.On the other hand,the genetic coefficient has a close relation with pulse voltage,the hereditary attenuation law accords with the function of I_n=1+e -an+β.Moreover,DSC analysis uncovers the variability of aluminum melt under pulse electric field,and validates the transferability of genetic carrier(cluster)among filial generations to a certain extent.

关 键 词：电脉冲孕育处理 铝熔体 遗传性 重熔实验 团簇 

分 类 号：TG111.4[金属学及工艺—物理冶金]