|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||Growth and Stress-induced Transformation of Zinc Blende AlN Layers in Al-AlN-TiN Multilayers
||Nan Li, Satyesh K. Yadav, Shuai Shao, Jian Wang, Xiang-Yang Liu, Amit Misra
|On-Site Speaker (Planned)
AlN is characterized by high ionicity, short bond length, low compressibility, high thermal conductivity, and a wide band gap. These properties make it useful in many applications. The equilibrium structure of AlN at ambient temperature and pressure is hexagonal wurtzite (w-AlN). Additionally, AlN also exists as a metastable cubic zinc-blende structure (z-AlN) or the high-pressure cubic rock-salt variant (r-AlN), as predicted using density functional theory. In this talk, we synthesized the metastable z-AlN nanolayers between Al(111) and TiN(111) layers during physical vapor deposition and addressed the growth mechanisms based on first-principles density function theory calculations. Through in situ indentation in a high-resolution TEM we further characterized the z-AlN to w-AlN transformation path with collective glide of Shockley partial dislocations on every two hexagonal close packed planes.
||Planned: A print-only volume