Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 13-14, Pages 3253-3258Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.02.031
Keywords
Nb-based alloy; Silicides; Mechanical alloying; Fracture toughness
Categories
Funding
- National Natural Science Foundation of China [50775052]
Ask authors/readers for more resources
Nb-16 at.% Si bulk alloys were fabricated by hot pressing from compound powders milled for different times. The influences of mechanical alloying on microstructure and mechanical properties of the hot-pressed alloys were investigated. The results indicate that the particle size of powders was significantly refined and the addition of absolute ethyl alcohol suppressed the agglomeration of powders. When milling time increased from 6 to 24 h, the constituent phases (Nbss, Nb5Si3 and Nb3Si) changed from large size trips to fine near-equiaxed shape, and the volume fraction of ductile Nbss decreased. In addition, Vickers hardness and flexural strength of bulk alloys increased gradually owing to the enhancement of the volume fraction of niobium silicides. Fracture toughness was in range of 10.98-13.23 MPa m(1/2), which was higher than that of cast materials. It was attributed to the positive role of ductile phase and fine-grain toughening. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available