Affiliation:
1. Department of Mechanical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
Abstract
The β-type and sintered Ti-3.6Fe-5Zr-0.2B (mass%) alloy has been consolidated by spark plasma sintering, followed by a β solution treatment (ST). In order to obtain a high-strength ductile balance, water quenching or air cooling is used after ST. Modification of sintering conditions, which leads to 100% of the relative density, improves the tensile ductility. The Fe addition causes a large local lattice and compressive strain to the bcc Ti lattice; in the water-quenched sample, α” martensite phases appear in the β matrix. When air cooling is applied after the ST, bimodal α lath phases are instead precipitated during the cooling in nanoscale, and the formation of α” martensite phases is suppressed. This results in high strength and better ductility when compared with those in the water-quenched sample, particularly in tensile properties. The air-cooled sample reveals attractive mechanical properties in both tension and compression modes.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
Reference40 articles.
1. Lütjering, G., and Williams, J.C. (2007). Titanium, Springer. [2nd ed.].
2. The effect of electric field and pressure on the synthesis and consolidation of materials: A review of the spark plasma sintering method;Munir;J. Mater. Sci.,2006
3. Spark plasma sintering of metals and metal matrix nanocomposites: A review;Saheb;J. Nanomater.,2012
4. Observation of particle behavior in copper powder compact during pulsed electric discharge;Yanagisawa;Mater. Sci. Eng. A,2003
5. Powder metallurgy of titanium–Past, present, and future;Fang;Int. Mater. Rev.,2018