Effects of Inert Nanoparticles of High-Melting-Point Compositions on Grain Structure and Strength of Ni3Al Intermetallic Compounds

7th International Scientific Practical Conference "Innovative Technologies in Engineering"

Ovcharenko, V.E.^1,2 ; Boyangin, E.N.^1 ; Chudinov, V.A.^1

Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences, 2/4 Prospect Academicheskiy, Tomsk

634021, Russia^1

Yurga Institute of Technology, National Research Tomsk Polytechnic University, Leningradskaya street 26, Yurga

652055, Russia^2

关键词: High-temperature synthesis;    Intermetallic grains;    Microscopic evaluation;    Nano-sized particles;    Polycrystalline structure;    Stoichiometric compositions;    Structure modification;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/142/1/012083/pdf
DOI  :  10.1088/1757-899X/142/1/012083

来源: IOP

【 摘 要 】

The paper represents experimental findings both in the area of effects of nanoparticles of inert high-melting-point TiN compounds on a Ni3Al intermetallic grain structure creation in the conditions of high temperature synthesis under pressure, and in the area of impact of grain structure modification on intermetallic compounds' strength factor temperature dependence. It was demonstrated that appending a stoichiometric composition of nanosized particles of high-melting-point inert chemical compounds (TiN) initiates a manyfold loss of average size of grain of Ni3Al intermetallic compounds, synthesized under pressure, as well as a sufficient intermetallic compounds' strength rise within a wide range of temperatures (up to 1 000 degree C). Electron-microscopic evaluations of a synthesized intermetallic structure with TiN nanoparticles, showed that, during the process of intermetallic polycrystalline structure creation from high temperature synthesis products melts, TiN nanoparticles are mainly spread throughout the boundaries and joints of grain structure, acting as stoppers of grain boundaries migration.