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辐照效应:材料科学与工程面临的挑战和机遇

来源:核科学与工程学院发布时间:2018-06-18

讲座题目】辐照效应:材料科学与工程面临的挑战和机遇

讲座时间】2018年6月19日(星期二)14:00

【讲座地点】北京校部主楼G209会议室

【主 讲 人】王鲁闽(WANG LUMIN) 教授

主讲人概况

王鲁闽教授1982年自北京赴美留学。1984年获美国威斯康星大学材料科学硕士学位,1988年获博士学位。此后, 他曾先后任职于美国阿岗国家实验室和新墨西哥大学。1997年受聘于密西根大学核工程与放射科学系。现为密西根大学核工程与放射科学系及材料科学与工程系两系终身教授(密西根大学核工系已连续十年在美国核工程系排名第一)。王教授于2005-2009任密西根大学电子显微分析实验室主任。他的主要研究方向包括核工程材料的辐照损伤,核废物处置及新型核燃料研发,离子束材料改性,离子束纳米材料制备。先后主持科研题目50余项,总经费数千万美金。已发表SCI收录的科研论文450余篇,论文已被引用万余次,h-因子= 58。王教授曾多次主持国际辐照损伤领域的学术研讨会,并应邀在各种国际学术会议及世界各著名科研机构与大学中演讲100余次,是美国材料研究学会, 核学会, 显微学会等学会会员,美国核学会国际合作委员会负责与中国联络的委员,中国国家自然科学基金委海外杰出青年基金获得者,曾任国际原子能机构核燃料长期储存顾问委员会顾问。

内容概况

The interaction of energetic particles with the atoms in the crystalline solid creates lattice defects. The exact fate of these defects or defect clusters in the nanoscale determines the performance of the material in a radiation environment. Typical radiation effects observed in metals and ceramics under the TEM include nanoscale void/bubble and dislocation loop formation, chemical segregation, irradiation induced precipitation and dissolution, with the “ultimate damage” considered to be solid state amorphization.  These changes at the nanoscale lead to macro-scale effects such as volume swelling, embitterment and accelerated stress corrosion cracking, increased corrosion and leaching rate, thus early failure of the material.

While nanoscience and engineering have been used to develop radiation tolerant materials, such as oxide dispersion strengthened alloys (ODS), radiation effects can also be utilized to generate various types of unique nanosctructures. The formation mechanisms for some of these structures are still not well understood. This talk will review the nanoscale radiation effects observed by the speaker’s research team, emphasizing examples that show radiation induced nanopatterning and how a group of amorphized material can be further damaged to form a nanoporous and fibrous assembly. The utilization of ion beam facilities of various kind and energy ranges for such studies will be demonstrated.

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