室温下球磨粉体中Sn晶须的自发生长

Formation of Sn whiskers from ball milled powder at room temperature

机械合金化3Ti/Sn/2C粉体，会细化晶粒，产生显微应力。在室温下，放置空气中1d后，即有少量Sn晶须出现，长约20μm；半年后，会形成大量直径约0．3-1μm，长约100μm的细晶须，以及直径约1～3μm，长达1．2mm的粗晶须。最后，探讨了Sn晶须的形成与自发生长机制。

Mechanical alloying of 3Ti/Sn/2C powder may refine the grains and produce the micro-strain. A small amounts of Sn whisker with the size of 20 μm presented in air at the room temperature. After semi-year, a large amounts of fine Sn whisker with a diameter of 0.3-1 μm and a length of 100 μm and coarse ones with a diameter of 1-3μm and a length of 1.2 mm were formed. At last, formation and spontaneous growth mechanism of Sn whisker were discussed.