A framework for shear driven dissolution of thermally stable particles during friction stir welding and processing

作者：Palanivel S; Arora A; Doherty K J; Mishra R S^*

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2016, 678: 308-314.

DOI：10.1016/j.msea.2016.10.015

• Friction stir welding
• Friction stir processing
• Dissolution
• Diffusion
• Numerical modeling

A framework is proposed to explain the dissolution and fragmentation of particles during friction stir welding and processing. Two major mechanisms dissolve the particle during the process: (i) thermally activated diffusion, and (ii) dislocation and grain boundary sweeping of atoms. We use a three-dimensional coupled viscoplastic flow and heat transfer model to quantify these mechanisms. For illustration purposes, calculations were done on a thermally stable Mg2Y intermetallic that dissolved during processing. The framework is universal and applies to any second phase dissolution and fragmentation during friction stir welding and processing, thus enabling a science-based approach to tailor microstructures.

• 出版日期2016-12-15