The Burgers vectors of dislocations in plastically deformed, polycrystalline B2 YAg intermetallic compound were determined by transmission electron microscopy using the g•b = 0 analysis. Both <001> and <111>-type dislocations were observed in specimens that had been deformed in tension; the <001> dislocations were more abundant. An active <111> slip direction satisfies the von Mises requirement of five independent slip systems that were necessary for a polycrystal to undergo a general homogeneous strain. Thus, <111> slip in YAg appears to be a key contributor to the high ductility and high fracture toughness previously reported for polycrystalline YAg.

Dislocations in the Ductile B2 YAg Intermetallic Compound. G.H.Cao, Z.Yu: Journal of Alloys and Compounds, 2009, 488[1], 44-6