Preparation of High-Temperature Multicomponent Alloys by Mechanochemical Synthesis from Refractory Elementsстатья
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Дата последнего поиска статьи во внешних источниках: 10 июля 2019 г.
Аннотация:Highly dispersed powders of two-phase multicomponent alloys have been prepared by mechanochemical synthesis from Hf0.5Nb0.5Ta0.5Ti1.5Zr1 (composition 1) and HfNbTaTiZrMo (composition 2) refractory-metal mixtures in a Fritsch (P-7) planetary mill under an Ar atmosphere. Two solid solutions, with BCC and HCP lattices, were obtained from the five-component mixture (composition 1). In the case of the six-component mixture (composition 2), both solid solutions had BCC lattices. Using compaction by hot isostatic pressing at a temperature of 1200°C, we obtained dense samples. Mechanical tests in compression showed a combination of high strength and plasticity. For sample 1, we obtained a yield stress σy = 1317 MPa, compressive breaking stress σb = 1340 MPa, and relative breaking spread of 7%. Even better results were obtained for sample 2: σy = 2153 MPa and σb = 2165 MPa, with δ = 10%.