期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 555, 期 -, 页码 339-346出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.12.068
关键词
Titanium alloys; Powder metallurgy; Boron; Refinement; Modification
资金
- Australian Research Council (ARC) through Centre of Excellence for Design in Light Metals
- ARC through an Australian Postdoctoral Fellowship
- The University of Queensland through an Early Career Researcher Grant
The effect of a small addition of boron (B) on the sintering, sintered microstructure and mechanical properties of a Ti-7Ni alloy (wt.%) compacted from -100 mesh hydride-dehydride (HDH) Ti powder has been investigated systematically. An addition of >= 0.62% B to the Ti-7Ni alloy resulted in fast, near full-densification (>= P99% relative density) within 15 min at 1200 degrees C, compared to 95.6% relative density obtained after 120 min at 1200 degrees C without B, compacted at 400 MPa in both cases. In addition, the pre-eutectoid alpha phase changed from long parallel alpha-laths (up to similar to 500 mu m) to near-equiaxed alpha-Ti throughout the microstructure with an addition of >= 0.31% B. Elemental B was found to be more effective than TiB2 as a sintering aid for Ti-7Ni. A small addition of B increased both the tensile strength and yield strength of Ti-7Ni but at the expense of tensile ductility. The mechanisms behind each of these observations were discussed. (C) 2012 Elsevier B. V. All rights reserved.
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