作者机构：
[谢焱石; 尹建文; 谭凯旋; 唐振平; 段先哲; 胡杨; 王正庆; 李春光; 王昭昭; 冯志刚] School of Nuclear Resources Engineering, Hunan Provincial Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang;Hunan;421001, China;[谢焱石; 尹建文; 谭凯旋; 唐振平; 段先哲; 胡杨; 王正庆; 李春光; 王昭昭; 冯志刚] Hunan;[谢焱石; 尹建文; 谭凯旋; 唐振平; 段先哲; 胡杨; 王正庆; 李春光; 王昭昭; 冯志刚] 421001, China
通讯机构：
[Tan, K.] S;School of Nuclear Resources Engineering, Hunan Provincial Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang, Hunan, China
作者机构：
[刘武; 张彦; 陈勇; 邱长军] Mechanical Engineering School, University of South China, Hengyang;421001, China;[刘武; 张彦; 陈勇; 邱长军] 421001, China
通讯机构：
[Qiu, C.] M;Mechanical Engineering School, University of South China, Hengyang, China
关键词：
激光快速成形;显微硬度;抗拉强度;断后伸长率;显微组织
摘要：
采用5 k W横流CO2激光器在Q235基材上快速成形三种不同成分的304不锈钢粉末,分别为标准304不锈钢粉末,添加CH化合物的304不锈钢粉末,添加CH化合物以及Ni60A的304不锈钢粉末,通过试验方法观察三种不同成分的304不锈钢激光快速成形试件的的显微组织,研究其综合力学性能.结果表明,在304不锈钢粉末内添加CH化合物能显著提高激光快速成型试件的显微硬度,抗拉强度和断后伸长率,显微组织得到细化;而同时添加CH化合物及Ni60A的试件的抗拉强度及显微硬度得到更大的提高,但断后伸长率却有一定程度的降低.
作者机构：
[刘永霞] School of Mechanical Engineering, University of South China, Hengyang, China;[刘永霞; 匡雅; 邹树梁] Hunan Key Laboratory of Nuclear Facilities Emergency Safety Technology and Equipment, Hengyang, China
作者机构：
[Zhang Zhen-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zhang Zhen-Hua; Lu, Gang] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Wei Ke-Wei; Lu, Gang] Henan Univ Technol, Coll Sci, Zhengzhou 450001, Peoples R China.;[Wei Ke-Wei] Anyang Normal Univ, Coll Phys & Elect Engn, Anyang 455002, Peoples R China.
通讯机构：
[Zhang Zhen-Hua] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
X(3872);mass degeneracy;B meson
摘要：
The spin is an important property of a particle. Although it is unlikely, there is still a possibility that two particles with different spins share similar masses. In this paper, we propose a method to probe this kind of mass degeneracy of particles with different spins. We use the cascade decay B+→X(3872)K+, X(3872)→D+D- to illustrate our method. It can be seen that the possible mass degeneracy of X(3872) can lead to interesting behavior in the corresponding cascade decay.
作者机构：
[朱红梅; 王新林] School of Mechanical Engineering, University of South China, Hengyang, Hunan, China;[匡同春; 谭超林] School of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong, China
作者机构：
[朱红梅; 尹泉; 彭如恕] School of Mechanical Engineering, University of South China
关键词：
激光技术;激光熔覆;高频微锻造;显微组织;显微硬度;电化学腐蚀
摘要：
对304 不锈钢基材表面制备的激光熔覆层进行了高频微锻造处理。通过光学显微镜和X 射线衍射仪分别研究了高频微锻造处理前后激光熔覆层的显微组织和相组成，利用显微维氏硬度计和电化学工作站分别对其进行了显微硬度测试和耐腐蚀性能测试。结果表明：经过高频微锻造处理后，激光熔覆层中的枝晶组织得到破碎，晶粒变细，但相组成无明显变化；微锻造作用区的显微硬度明显提高，影响深度为0.65 mm，表层硬度提高了约30%，高频微锻造处理对激光熔覆层的硬度影响程度随着距表层距离的增加而下降；激光熔覆层的耐腐蚀性能经微锻造处理后得到改善，为原始的2 倍。 The laser cladding layer on the 304 stainless steel surface is modified by a high-frequency microforging process. The microstructure and phase constitution of the laser cladding layer before and after the high-frequency microforging treatment are characterized by using optical microscopy and X-ray diffraction. The microhardness distribution and corrosion property of the counterparts are examined by Vickers microhardness tester and the electrochemical work station, respectively. The results show that laser cladding layer is of a broken dendritic microstructure and refined grain size after microforging, while there is no obvious change in the phase constitution. The microhardness of the microforged area is greatly enhanced with an affected depth of 0.65 mm. The average microhardness of the surface is improved by about 30% and the microhardness increment decreases gradually with the increasing distance from the top of the cladding layer. The corrosion resistance of the laser cladding layer is improved by nearly two folds after microforging.
摘要：
The morphology and orientation of the growth twins formed in the cast Mg-Zn-Cu-Zr alloys aged at 100 ℃ were characterized using optical microscopy and transmission electron microscopy. It was found that twins were invisible in the as-cast or solutionized Mg-Zn-Cu-Zr alloys while {1012} twins were exclusively formed in the aged condition. The twinning behavior was significantly affected by two factors, namely, the Zn content and the heat treatment process. A possible formation mechanism of such growth twins was discussed using the viewpoint of vacancy.
作者机构：
[陈磊; 王坚; 李晓华] School of Electronic Science and Engineering, Southeast University, Nanjing, China;[夏振平] College of Electronic and Information Engineering, Suzhou University of Science and Technology, Suzhou, China;[陈磊] School of Physics Science and Technology, Yangzhou University, Yangzhou, China
通讯机构：
School of Electronic Science and Engineering, Southeast University, Nanjing, China
