Fatigue crack growth in the welding nuggetof FSW joints of a 6060 aluminum alloy6060铝合金搅拌摩擦焊焊接接头的疲劳裂纹扩展行为Friction stir welded butt joints were performed on 8 mm thick sheets made of AA6060 T6 aluminum alloy by means of a CNC machine tool, at feed rates between 117 and 683 mm/min ...
磷(P)是最普遍的元素之一,在地球上的储量有大约1000亿吨,且在化学,物理学,生物学和生态学等领域均具有重要意义。自17世纪60年代被发现以来,对不同种类的P的同素异形体的改性,已经受到科研工作者广泛的关注。单质具有的半导体性质是非常有趣和引人关注的现象,最近,香港中文大学的Jimmy C. Yu教授课题组取得一个重大...