Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7975946 | Materials Science and Engineering: A | 2016 | 11 Pages |
Abstract
Ti-6Al-4V was recycled from machining chips by using equal channel angular pressing (ECAP). Samples were pressed through a die up to 8 passes at moderate temperatures in the range of 400-500 °C. The ECAP process was accomplished with back-pressures ranging from 50 to 250 MPa. The results demonstrate that ECAP with back-pressures allows the consolidation of machining chips to near fully dense (~99.9%) recycled products. The relative density of the as-recycled samples increased with the applied back-pressure and number of passes. The average hardness and homogeneity were improved as the number of passes increased. The transmission electron microscopy reveals a combination of equiaxed and elongated α grains after the first pass. With subsequent pressing, the samples were dominated by nano-equiaxed α grains with diameters of ~70 nm. The original β phase in the machining chips was fragmented during the ECAP process.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Q. Shi, Y.Y. Tse, R.L. Higginson,