Microstructural Evolution and Mechanical Properties of a Multicomponent Nb-16Si-22Ti-2Al-2Hf-2Cr Alloy Prepared by Reactive Hot Press Sintering
作者： W. Liu , Y. M. Fu , J. B. Sha
DOI: 10.1007/S11661-012-1571-0
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摘要: In this paper, the effect of reactive hot press sintering (RHPS) parameters, such as milling time, pressing temperature, and heat treatment, on phase constitution, microstructure, room temperature mechanical properties a multicomponent Nb-16Si-22Ti-2Hf-2Al-2Cr alloy prepared from ball milled powder mixture is investigated. Evaluation microstructure revealed that all as-sintered heat-treated samples mainly consisted particles Nb Ti solid solutions (NbSS TiSS), well niobium silicide β-Nb5Si3 matrix, with small quantity Hf solution (HfSS). By at 1773 K 1873 (1500 °C 1600 °C), most NbSS in 5 10 mixtures showed narrow strip morphology. Upon increasing time to 20 hours, morphology changed near-equiaxed shape, which became finer increased time. contrast, TiSS more or less had shape. Spheroidizing tendency took place both phases during an annealing treatment °C) for 50 hours. Interestingly, when was extended volume fractions increased, whereas decreased. This resulted reduction fracture toughness KQ enhancement Vickers hardness Hv bulk samples. A fractography analysis also carried out elucidate behavior phases, particular emphasis interaction between cracks.
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