Grain-size-dependent non-monotonic lattice parameter variation in nanocrystalline W: The role of non-equilibrium grain boundary structure

作者：Srivastav Ajeet K^*; Chawake Niraj; Murty B S

来源：Scripta Materialia, 2015, 98: 20-23.

DOI：10.1016/j.scriptamat.2014.11.005

• Tungsten
• Mechanical milling
• Lattice parameter
• Non-equilibrium grain boundary
• Dislocation density

The grain size dependency of lattice parameter during high-energy ball milling of W has been investigated. The lattice parameter varies non-monotonically with grain size during milling with a lattice contraction initially followed by an expansion. The lattice parameters were calculated in view of the non-equilibrium grain boundary structure that evolved during milling using excess free volume and the interfacial stresses at the grain boundaries. The calculated lattice parameters closely match the experimentally observed values.

• 出版日期2015-3-15