本文主要研究内容
作者贾丽静（2019）在《相分离非晶合金Cu50Ag50的结构和力学相关性》一文中研究指出：虽然关于相分离非晶合金的研究己经有很多,但是其微观结构和宏观力学之间的关系仍然不是很清晰。本论文通过基于EAM作用势的分子动力学模拟来研究Cu50Ag50相分离非晶合金在拉伸和压缩应变下的塑性变形机制以及在交变应变作用下的动态力学性能。本文的研究表明,非晶合金Cu50Ag50样本中同类原子之间的作用力要强于异类原子,表现出较高的相分离程度。随着拉伸和压缩应变的增大,样本在两种变形模式下的相分离程度都有增大的趋势,样本具有较好的拉伸和压.缩塑性,其塑性变形机制类似。通过对应力应变曲线和局部剪切应变的研究发现,Ag原子具有更高的局部剪切应变,在塑性变形过程中富Ag区首先屈服并形成剪切带,剪切带沿着富Ag区形成纵横交错的网络状分布并最终扩展至富Cu区。对两种变形模式下的结构进行分析,发现在塑性变形过程中,富五边形多面体联结形成框架起到抵抗剪切变形的作用。样本中Ag原子表现出较高的Voronoi体积和势能,并且在塑性变形过程中,Ag原子的Voronoi体积和势能都几乎稳定不变,这是因为富Ag区发生了屈服,释放了弹性势能,并且原子发生了重新排列。而富Cu区没有完全屈服,所以Cu原子的平均势能始终在增大。本文对Cu50Ag50非晶合金进行了动态力学分析。其内部存在未被完全冻结的类液区,类液区不能储存弹性能,在交变应变作用下发生流变并消耗能量导致机械滞后,并且滞后程度随着温度的升高而增大。Cu50Ag50非晶合金的β弛豫表现的比较微弱,是以过剩尾的形式表现出来的。温度较低时,储能模量随着频率增大而增大,温度较高时,随频率的变化和低温时相反,这可能是因为在高温低频条件下样本中发生了结晶行为导致的。机械应变和温度对样本的弛豫动力学的影响作用是类似的。非晶合金在热力学上处于亚稳态,在外界温度和应力的影响下可能会发生晶化现象。本文研究了不同温度和交变应变加载振幅作用下样本的晶化行为,发现晶体含量随着加载振幅的增大而增大。在温度低于500K时,晶体含量随着温度升高而增大,而温度高于500K时晶体含量有所降低,这是因为高温下原子热运动剧烈,晶核不稳定,结晶速率受到限制。通过对500K下加载周期为200ps,加载振幅为5%的样本晶化行为进行研究,本论文发现结晶起源是应力诱导,且富Ag区中首先产生晶核,然后晶核不断长大,紧接着富Cu区中也出现了晶体结构。晶化过程中类晶Voronoi多面体(0,3,6,3)(0,4,4,4)的数量不断增大,同时原子平均势能不断降低。且以Ag原子的多面体的变化以及Ag原子平均势能的下降要早于Cu原子,这是因为晶化过程中富Ag区首先形成晶体结构。
Abstract
sui ran guan yu xiang fen li fei jing ge jin de yan jiu ji jing you hen duo ,dan shi ji wei guan jie gou he hong guan li xue zhi jian de guan ji reng ran bu shi hen qing xi 。ben lun wen tong guo ji yu EAMzuo yong shi de fen zi dong li xue mo ni lai yan jiu Cu50Ag50xiang fen li fei jing ge jin zai la shen he ya su ying bian xia de su xing bian xing ji zhi yi ji zai jiao bian ying bian zuo yong xia de dong tai li xue xing neng 。ben wen de yan jiu biao ming ,fei jing ge jin Cu50Ag50yang ben zhong tong lei yuan zi zhi jian de zuo yong li yao jiang yu yi lei yuan zi ,biao xian chu jiao gao de xiang fen li cheng du 。sui zhao la shen he ya su ying bian de zeng da ,yang ben zai liang chong bian xing mo shi xia de xiang fen li cheng du dou you zeng da de qu shi ,yang ben ju you jiao hao de la shen he ya .su su xing ,ji su xing bian xing ji zhi lei shi 。tong guo dui ying li ying bian qu xian he ju bu jian qie ying bian de yan jiu fa xian ,Agyuan zi ju you geng gao de ju bu jian qie ying bian ,zai su xing bian xing guo cheng zhong fu Agou shou xian qu fu bing xing cheng jian qie dai ,jian qie dai yan zhao fu Agou xing cheng zong heng jiao cuo de wang lao zhuang fen bu bing zui zhong kuo zhan zhi fu Cuou 。dui liang chong bian xing mo shi xia de jie gou jin hang fen xi ,fa xian zai su xing bian xing guo cheng zhong ,fu wu bian xing duo mian ti lian jie xing cheng kuang jia qi dao di kang jian qie bian xing de zuo yong 。yang ben zhong Agyuan zi biao xian chu jiao gao de Voronoiti ji he shi neng ,bing ju zai su xing bian xing guo cheng zhong ,Agyuan zi de Voronoiti ji he shi neng dou ji hu wen ding bu bian ,zhe shi yin wei fu Agou fa sheng le qu fu ,shi fang le dan xing shi neng ,bing ju yuan zi fa sheng le chong xin pai lie 。er fu Cuou mei you wan quan qu fu ,suo yi Cuyuan zi de ping jun shi neng shi zhong zai zeng da 。ben wen dui Cu50Ag50fei jing ge jin jin hang le dong tai li xue fen xi 。ji nei bu cun zai wei bei wan quan dong jie de lei ye ou ,lei ye ou bu neng chu cun dan xing neng ,zai jiao bian ying bian zuo yong xia fa sheng liu bian bing xiao hao neng liang dao zhi ji xie zhi hou ,bing ju zhi hou cheng du sui zhao wen du de sheng gao er zeng da 。Cu50Ag50fei jing ge jin de βchi yu biao xian de bi jiao wei ruo ,shi yi guo sheng wei de xing shi biao xian chu lai de 。wen du jiao di shi ,chu neng mo liang sui zhao pin lv zeng da er zeng da ,wen du jiao gao shi ,sui pin lv de bian hua he di wen shi xiang fan ,zhe ke neng shi yin wei zai gao wen di pin tiao jian xia yang ben zhong fa sheng le jie jing hang wei dao zhi de 。ji xie ying bian he wen du dui yang ben de chi yu dong li xue de ying xiang zuo yong shi lei shi de 。fei jing ge jin zai re li xue shang chu yu ya wen tai ,zai wai jie wen du he ying li de ying xiang xia ke neng hui fa sheng jing hua xian xiang 。ben wen yan jiu le bu tong wen du he jiao bian ying bian jia zai zhen fu zuo yong xia yang ben de jing hua hang wei ,fa xian jing ti han liang sui zhao jia zai zhen fu de zeng da er zeng da 。zai wen du di yu 500Kshi ,jing ti han liang sui zhao wen du sheng gao er zeng da ,er wen du gao yu 500Kshi jing ti han liang you suo jiang di ,zhe shi yin wei gao wen xia yuan zi re yun dong ju lie ,jing he bu wen ding ,jie jing su lv shou dao xian zhi 。tong guo dui 500Kxia jia zai zhou ji wei 200ps,jia zai zhen fu wei 5%de yang ben jing hua hang wei jin hang yan jiu ,ben lun wen fa xian jie jing qi yuan shi ying li you dao ,ju fu Agou zhong shou xian chan sheng jing he ,ran hou jing he bu duan chang da ,jin jie zhao fu Cuou zhong ye chu xian le jing ti jie gou 。jing hua guo cheng zhong lei jing Voronoiduo mian ti (0,3,6,3)(0,4,4,4)de shu liang bu duan zeng da ,tong shi yuan zi ping jun shi neng bu duan jiang di 。ju yi Agyuan zi de duo mian ti de bian hua yi ji Agyuan zi ping jun shi neng de xia jiang yao zao yu Cuyuan zi ,zhe shi yin wei jing hua guo cheng zhong fu Agou shou xian xing cheng jing ti jie gou 。
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论文作者分别是来自山东大学的贾丽静，发表于刊物山东大学2019-07-16论文，是一篇关于相分离非晶合金论文,拉伸压缩变形论文,动力学弛豫论文,品化论文,山东大学2019-07-16论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自山东大学2019-07-16论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：相分离非晶合金论文; 拉伸压缩变形论文; 动力学弛豫论文; 品化论文; 山东大学2019-07-16论文;