By a News Reporter-Staff News Editor at Mining & Minerals -- Investigators discuss new findings in Metals Research - Metallurgy. According to news reporting originating in Xuzhou, People’s Republic of China, by VerticalNews journalists, research stated, “Porous TiAl3 intermetallics were fabricated through vacuum reactive sintering from Ti-75Al at.% elemental powder mixture. The phase compositions, expansion behaviors, pore characteristics and microstructure evolution of TiAl3 intermetallics were investigated, and the pore formation mechanism was also proposed.”
The news reporters obtained a quote from the research from the China University of Mining and Technology, “It was found that the actual temperature of compacts showed an acute climb from 668 to 1244 degrees C in 166s, while the furnace temperature maintained the linear growth of 5 degrees C/min, which indicated that an obvious thermal explosion (TE) reaction occurred during sintering, and only single-phase TiAl3 intermetallic was synthesized in TE products. The open porosity increased from 22.2 (green compact) to 32.8% after reactive diffusion sintering at 600 degrees C and rised to 58.7% after TE, then decreased to 51.2% after high-temperature homogenization at 1100 degrees C. Therefore, TE reaction is the dominated pore formation mechanism of porous TiAl3 intermetallics. The pore evolution in porous TiAl3 intermetallics occurred by the following mechanisms: certain intergranular pores remained among powder particles of green compact, then low-temperature sintering resulted in a further increase in porosity due to the Kirkendall effect.”
According to the news reporters, the research concluded: “Moreover, TE reaction gave rise to a dramatic volume expansion because of the rapid increase in temperature, and high-temperature sintering caused densification and a slight shrinkage.”
For more information on this research see: Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering. Acta Metallurgica Sinica-English Letters , 2018;31(4):440-448. Acta Metallurgica Sinica-English Letters can be contacted at: Chinese Acad Sciences, Inst Metal Research, 72 Wenhua Rd, Shenyang, 110016, Peoples R China.
Our news correspondents report that additional information may be obtained by contacting X.H. Wang, China Univ Min & Technol, Sch Mat Sci & Engn, Xuzhou 221116, People’s Republic of China. Additional authors for this research include X.Y. Jiao, P.Z. Feng, Y.N. Liu, L.Q. Zhang and F. Akhtar.
The direct object identifier (DOI) for that additional information is: https://doi.org/10.1007/s40195-017-0663-7. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.
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CITATION: (2018-05-04), Researchers from China University of Mining and Technology Provide Details of New Studies and Findings in the Area of Metallurgy (Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering), Mining & Minerals, 19, ISSN: 1944-2475, BUTTER® ID: 015606583
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