The effects of equal channel angular extrusion on the mechanical and
electrical properties of alumina dispersion-strengthened copper alloys Materials Science & Engineering A
565(2013)P450-458
知道为电阻率的比值,他比较的是常温和液氮下的电阻率比值,就是我回复上面那个人的那篇文章,而且在别的文章中也看到过,都是常温下电阻与液氮下电阻的比值,不知道这个数值有何用啊,还有一个这样的术语RRR-residual resistance ratio, generally defined in terms of resistance values as R(RT)/R(4.2 K),更不知道有何用了