Micro-extrusion process and microstructure evolution of miniature heat pipe in 6063 aluminum alloy

Micro-extrusion process of miniature heat pipe (MHP) with axial micro grooves is particularly difficult due to ultra-large extrusion ratio and complex cross-sectional shape. In this study, the shape control 6063 aluminum alloy MHP fabricated by micro-extrusion was successfully overcome, microstructure evolution in using as-extruded billets studied. The results obtained finite element (FE) analysis experiments show that material flow deformation behavior highly affected size effect, lower ram speed conductive forming integrity, dimension accuracy, surface quality extruded profiles. primary mechanism for failure micro-grooves severely more uneven between rib base region at higher speed, which caused effect shear even fractures ribs. Further research shows compared as-cast billets, much coarser grains were after an 205. Besides that, entirely different texture components instead typical < 100 > //the direction (ED) or 111 //ED fiber components. These atypical can be regarded as deviating from ideal a certain angle (15° 20°) along ? axis ?1 axis.