Influence of Alumina Nanofibers Sintered by the Spark Plasma Method on Nickel Mechanical Properties

Metals

Valeriy Kostikov¹  Zhanna Eremeeva¹  Yuri Solyaev²  Gleb Belov³  Leonid Agureev⁴  Svetlana Savushkina⁴  Boris Ivanov⁴  Dmitriy Khmelenin⁵ 

[1] Department of Powder Metallurgy and Functional Coatings, National University of Science and Technology “MISIS”, 119991 Moscow, Russia;Institute of Applied Mechanics of Russian Academy of Sciences, 125040 Moscow, Russia;Joint Institute for High Temperatures of the Russian Academy of Sciences, 125412 Moscow, Russia;Keldysh Research Center, 125438 Moscow, Russia;Shubnikov Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia;

关键词: nanofibers;    powder metallurgy;    spark plasma sintering;    elastic modulus;    tensile strength;    nickel;   

DOI  :  10.3390/met11040548

来源: DOAJ

【 摘 要 】

The article presents the study of alumina nanoparticles’ (nanofibers) concentration effect on the strength properties of pure nickel. The samples were obtained by spark plasma sintering of previously mechanically activated metal powders. The dependence of the grain size and the relative density of compacts on the number of nanofibers was investigated. It was found that with an increase in the concentration of nanofibers, the average size of the matrix particles decreased. The effects of the nanoparticle concentration (0.01–0.1 wt.%) on the elastic modulus and tensile strength were determined for materials at 25 °C, 400 °C, and 750 °C. It was shown that with an increase in the concentration of nanofibers, a 10–40% increase in the elastic modulus and ultimate tensile strength occurred. A comparison of the mechanical properties of nickel in a wide range of temperatures, obtained in this work with materials made by various technologies, is carried out. A description of nanofibers’ mechanisms of influence on the structure and mechanical properties of nickel is given. The possible impact of impurity phases on the properties of nickel is estimated. The tendency of changes in the mechanical properties of nickel, depending on the concentration of nanofibers, is shown.

【 授权许可】

Unknown