Al-1at.%Mg合金のひずみ時効とPortevin-LeChatelier効果との関連
Al-1at.%Mg合金のひずみ時効とPortevin-LeChatelier効果との関連
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Al-1at.%Mg合金应变时效与Portevin-LeChatelier效应的关系
DOI：
10.2464/jilm.21.358
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发表时间：
1971
期刊：
影响因子：
--
通讯作者：
秀雄 河野
中科院分区：
文献类型：
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作者：
精 三浦;秀雄 河野
为了阐明P-L效应的机理，研究了应变时效与Portevin-LeChatelier效应（动态应变时效）的关系在-60 °-20 ° C拉伸2%的镁合金，在变形温度下进行间断载荷时效，应变时效过程分为两个阶段。第一阶段不到7秒。时效时间近似符合t ~（2/3）时间规律，激活能为0.21eV。第二阶段的时间法则，超过10秒。在时效时间上，约为t1/3，激活能为0.45eV。第二阶段的激活能被解释为Mg原子-单空位对的迁移能。该合金P-L效应过程中通常发现的0.60eV激活能被假定为Mg原子-单空位对的迁移能，其中一部分通过切断Mg原子与空位之间的结合而移动，因为P-结果表明，应变诱发的空位对屈服点的出现起着重要作用由于应变时效，形成了消除应变时效发生前存在的空位的实验结果。综合以上研究结果，可以认为P-L效应是塑性变形过程中发生的应变时效现象。
The relation between strain aging and Portevin-LeChatelier effect (dynamic strain aging) was studied for clarifying the mechanism of P-L effect.Experiments for strain aging were conducted on Al-1at.%Mg alloy which had been stretched by 2%at-60°-20°C, and then, aged at the deformation temperature under interrupted load.The strain aging process was divided into two stages. The 1st stage of less than 7sec. in aging time approximately conformed to the time law of t2/3 and the activation energy was found to be 0.21eV. The time law in the 2nd stage, more than 10sec. in aging time, was approximately to t1/3 and the value of activation energy was 0.45eV. The activation energy in the 2nd stage was interpreted as the migration energy of pairs of Mg atom-single vacancy. The activation energy of 0.60eV previcusly found in the process of P-L effect of this alloy was assumed to be the migration energy of Mg atom-single vacancy pairs, part of which move by cutting the binding between the Mg atom and the vacancy, becuase P-L effect occurred at higher temperature than that for strain aging.It was noted that the vacancies induced by strain played an important role in appearance of yield point due to strain aging form the results of experiments for eliminating the vacancies which had existed before the occurrence of strain aging. As the results of above studies, it may be concluded that P-L effect is the phenomenon in which strain aging occurs during plastic deformation.