The spark plasma sintering (SPS) method is used to prepare the ultrafine copper with the average grain size less than 10 μm and the tensile strength greater th
时间不同,情况亦异,两者不能相提并论。世间万物的存在、运行皆有规律。那些规律也在不断地演绎着许多形形色色、符合逻辑的、不合逻辑的种种。自然也形成了“此一时,彼一时
An as-cast magnesium alloy with high Al content Mg15Al was subjected to equal-channel angular pressing (ECAP) through a die with an angle of φ= 90? at 553 K fo
伴随着社会经济“快餐化”消费时代的到来,“90后”作为受经济时代影响最深的大学生群体,在中职院校的学习环境中,出现了非常普遍并且极其严重的不理智性消费行为,其所影射的