Metastable phases in the Co–W system traced from elemental Co and W powders
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Abstract
Abstract X-ray diffraction technique was used to identify the phases of the milled and annealed elemental Co, W and Co–W powder mixture. Structural similarities in metastable phases of elemental Co and W have been obtained. The η-phase with 11.037 A was detected in both milled and annealed W as well as in the Co–W alloy. In addition, metastable FCC Co (W) solid solution of 3.544 A was detected. Upon annealing a 30 h milled Co powder compact at 800 °C, two metastable FCC phases with lattice parameters of 3.506 A and 4.162 A were obtained. For milled, annealed and water-quenched W at 1000 °C, metastable FCC phases with a = 3.510 A and 4.177 A were obtained. Furthermore, metastable HCP phase with a = 2.731 A; c = 4.319 A was detected after annealing of milled W at 1000 °C.
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