本文主要研究内容
作者杜玉峰（2019）在《铁基二元合金辐照损伤及气泡在电子束辐照下的行为研究》一文中研究指出：本文使用离子辐照时遮挡铜网的方法研究了 Fe-Al合金在高温He离子辐照过程中晶界、点缺陷和溶质原子三者之间的作用。结果表明,空位由辐照区流向未辐照区,造成辐照区A1元素含量比未辐照区高;可能由于空位扩散流动具有晶体取向性,晶界两侧辐照区与未辐照区A1元素成分差别不同,温度效应可以消除空位扩散的晶体取向性;随着辐照温度从300 ℃升高到400 ℃辐照区和未辐照区成分差别减小;辐照后对比辐照区和未辐照区同一个晶界上A1元素的分布,发现A1在晶界上的偏析并不明显。通过超高压电镜原位电子辐照实验证实了遮挡铜网离子辐照方法所得到的实验数据的可靠性。研究了氢与点缺陷协同作用对Cr析出的影响,并利用透射电子显微镜对Cr析出物进行表征。结果显示,室温注氢后Fe-10at%tCr合金在超高压电镜下在450 ℃～550 ℃温度区间进行电子辐照后,衍射花样中出现衍射条纹;在400 ℃以下及600 ℃以上温度进行电子辐照后衍射花样中则不会产生衍射条纹。透射电镜分析结果显示,条纹衍射是由Cr的一维针状析出产生,这种析出可能是Cr与H形成某种Cr-H复合体,在电子束辐照下,沿三个<100>方向重新排列。析出物的密度随着温度升高逐渐降低,而析出物的尺寸先增大后减小。课题组前期研究结果显示纯铁室温注入氢离子后,经500 ℃退火会形成直径约为100 nm的空位型位错环,但不同合金元素对空位型位错环影响仍然不清楚。本文利用超高压电镜原位电子辐照研究了室温注氢Fe-Cr合金中空位型位错环的形成,讨论了合金元素对空位型位错环形成的影响。结果发现,室温注氢Fe-Cr合金在550℃及以下温度退火后形成的位错环为间隙型位错环;在600℃及以上温度退火后有空位型位错环形成。综合课题组之前的研究结果,得出Ni元素能够降铁中空位型位错环形成温度,Cr元素能够提高铁中空位型位错环的形成温度,讨论了合金元素对铁中空位型位错环形成温度的影响,提出了一种按照提高或降低空位型位错环形成温度来对合金元素进行分类的方法。此外还利用普通透射电镜,通过构建位错环在不同晶带轴下的投影图结合位错环消光判据g·b=0,对室温注氢Fe-Cr合金在550 ℃及以下不同温度下退火形成的间隙型位错环进行了表征。表征结果显示,在400 ℃和500 ℃退火后,室温注氢Fe-Cr合金中<100>型位错环所占比例分别为16.48%、92.78%;当退火温度升高到550 ℃时位错环全部为<100>型,说明Fe-10at%Cr合金中位错环类型转变温度区间为400℃～500℃,与纯铁相比,添加Cr元素能够使位错环类型转变温度升高。关于气泡在电子束辐照下的行为研究,本文利用透射电子显微镜对纯铝中惰性气体气泡在电子束辐照下的异常放热行为进行了原位观察实验。结果表明,纯铝中氦氖氩三种惰性气体气泡分别在200 keV电子束辐照过程中气泡均合并长大,逐渐变亮,最终爆裂开来,气泡内部形成许多小黑点,选区电子衍射花样由单晶花样变为多晶衍射环,在这一过程中可能发生了某种异常放热反应导致气泡附近铝融化后重新凝固产生多晶。并且随着注入气体离子剂量增加,辐照区发生多晶化所需辐照时间缩短。而氦气泡在80keV电子束辐照下及氦氩混合气体气泡在200 keV电子束辐照下气泡形貌和选区电子衍射花样均保持不变,无多晶环产生,说明气泡在电子束辐照下的异常放热反应与电子束能量和气泡内气体压力有关。
Abstract
ben wen shi yong li zi fu zhao shi zhe dang tong wang de fang fa yan jiu le Fe-Alge jin zai gao wen Heli zi fu zhao guo cheng zhong jing jie 、dian que xian he rong zhi yuan zi san zhe zhi jian de zuo yong 。jie guo biao ming ,kong wei you fu zhao ou liu xiang wei fu zhao ou ,zao cheng fu zhao ou A1yuan su han liang bi wei fu zhao ou gao ;ke neng you yu kong wei kuo san liu dong ju you jing ti qu xiang xing ,jing jie liang ce fu zhao ou yu wei fu zhao ou A1yuan su cheng fen cha bie bu tong ,wen du xiao ying ke yi xiao chu kong wei kuo san de jing ti qu xiang xing ;sui zhao fu zhao wen du cong 300 ℃sheng gao dao 400 ℃fu zhao ou he wei fu zhao ou cheng fen cha bie jian xiao ;fu zhao hou dui bi fu zhao ou he wei fu zhao ou tong yi ge jing jie shang A1yuan su de fen bu ,fa xian A1zai jing jie shang de pian xi bing bu ming xian 。tong guo chao gao ya dian jing yuan wei dian zi fu zhao shi yan zheng shi le zhe dang tong wang li zi fu zhao fang fa suo de dao de shi yan shu ju de ke kao xing 。yan jiu le qing yu dian que xian xie tong zuo yong dui Crxi chu de ying xiang ,bing li yong tou she dian zi xian wei jing dui Crxi chu wu jin hang biao zheng 。jie guo xian shi ,shi wen zhu qing hou Fe-10at%tCrge jin zai chao gao ya dian jing xia zai 450 ℃～550 ℃wen du ou jian jin hang dian zi fu zhao hou ,yan she hua yang zhong chu xian yan she tiao wen ;zai 400 ℃yi xia ji 600 ℃yi shang wen du jin hang dian zi fu zhao hou yan she hua yang zhong ze bu hui chan sheng yan she tiao wen 。tou she dian jing fen xi jie guo xian shi ,tiao wen yan she shi you Crde yi wei zhen zhuang xi chu chan sheng ,zhe chong xi chu ke neng shi Cryu Hxing cheng mou chong Cr-Hfu ge ti ,zai dian zi shu fu zhao xia ,yan san ge <100>fang xiang chong xin pai lie 。xi chu wu de mi du sui zhao wen du sheng gao zhu jian jiang di ,er xi chu wu de che cun xian zeng da hou jian xiao 。ke ti zu qian ji yan jiu jie guo xian shi chun tie shi wen zhu ru qing li zi hou ,jing 500 ℃tui huo hui xing cheng zhi jing yao wei 100 nmde kong wei xing wei cuo huan ,dan bu tong ge jin yuan su dui kong wei xing wei cuo huan ying xiang reng ran bu qing chu 。ben wen li yong chao gao ya dian jing yuan wei dian zi fu zhao yan jiu le shi wen zhu qing Fe-Crge jin zhong kong wei xing wei cuo huan de xing cheng ,tao lun le ge jin yuan su dui kong wei xing wei cuo huan xing cheng de ying xiang 。jie guo fa xian ,shi wen zhu qing Fe-Crge jin zai 550℃ji yi xia wen du tui huo hou xing cheng de wei cuo huan wei jian xi xing wei cuo huan ;zai 600℃ji yi shang wen du tui huo hou you kong wei xing wei cuo huan xing cheng 。zeng ge ke ti zu zhi qian de yan jiu jie guo ,de chu Niyuan su neng gou jiang tie zhong kong wei xing wei cuo huan xing cheng wen du ,Cryuan su neng gou di gao tie zhong kong wei xing wei cuo huan de xing cheng wen du ,tao lun le ge jin yuan su dui tie zhong kong wei xing wei cuo huan xing cheng wen du de ying xiang ,di chu le yi chong an zhao di gao huo jiang di kong wei xing wei cuo huan xing cheng wen du lai dui ge jin yuan su jin hang fen lei de fang fa 。ci wai hai li yong pu tong tou she dian jing ,tong guo gou jian wei cuo huan zai bu tong jing dai zhou xia de tou ying tu jie ge wei cuo huan xiao guang pan ju g·b=0,dui shi wen zhu qing Fe-Crge jin zai 550 ℃ji yi xia bu tong wen du xia tui huo xing cheng de jian xi xing wei cuo huan jin hang le biao zheng 。biao zheng jie guo xian shi ,zai 400 ℃he 500 ℃tui huo hou ,shi wen zhu qing Fe-Crge jin zhong <100>xing wei cuo huan suo zhan bi li fen bie wei 16.48%、92.78%;dang tui huo wen du sheng gao dao 550 ℃shi wei cuo huan quan bu wei <100>xing ,shui ming Fe-10at%Crge jin zhong wei cuo huan lei xing zhuai bian wen du ou jian wei 400℃～500℃,yu chun tie xiang bi ,tian jia Cryuan su neng gou shi wei cuo huan lei xing zhuai bian wen du sheng gao 。guan yu qi pao zai dian zi shu fu zhao xia de hang wei yan jiu ,ben wen li yong tou she dian zi xian wei jing dui chun lv zhong duo xing qi ti qi pao zai dian zi shu fu zhao xia de yi chang fang re hang wei jin hang le yuan wei guan cha shi yan 。jie guo biao ming ,chun lv zhong hai nai ya san chong duo xing qi ti qi pao fen bie zai 200 keVdian zi shu fu zhao guo cheng zhong qi pao jun ge bing chang da ,zhu jian bian liang ,zui zhong bao lie kai lai ,qi pao nei bu xing cheng hu duo xiao hei dian ,shua ou dian zi yan she hua yang you chan jing hua yang bian wei duo jing yan she huan ,zai zhe yi guo cheng zhong ke neng fa sheng le mou chong yi chang fang re fan ying dao zhi qi pao fu jin lv rong hua hou chong xin ning gu chan sheng duo jing 。bing ju sui zhao zhu ru qi ti li zi ji liang zeng jia ,fu zhao ou fa sheng duo jing hua suo xu fu zhao shi jian su duan 。er hai qi pao zai 80keVdian zi shu fu zhao xia ji hai ya hun ge qi ti qi pao zai 200 keVdian zi shu fu zhao xia qi pao xing mao he shua ou dian zi yan she hua yang jun bao chi bu bian ,mo duo jing huan chan sheng ,shui ming qi pao zai dian zi shu fu zhao xia de yi chang fang re fan ying yu dian zi shu neng liang he qi pao nei qi ti ya li you guan 。
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论文作者分别是来自北京科技大学的杜玉峰，发表于刊物北京科技大学2019-01-16论文，是一篇关于辐照损伤论文,晶界论文,析出论文,位错环论文,气泡论文,北京科技大学2019-01-16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，资料来自北京科技大学2019-01-16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。