Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System
Skakov M. Kozhakhmetov Y. Mukhamedova N. Miniyazov A. Sokolov I. Urkunbay A. Zhanbolatova G. Tulenbergenov T.
August 2022MDPI
Materials
2022#15Issue 16
In this research, samples of an alloy with a bimodal structure were studied on the basis of a previously developed technology for obtaining hydrogen storage materials based on the Ti-Al-Nb system. The results of SPS of mechanically activated powder mixtures of the Ti-Al-Nb system at a temperature of 1300 °C make it possible to obtain an alloy with a predominantly bimodal structure. However, an insignificant presence of TiAl3, AlNb2 phases, and unreacted niobium is still observed in the structure. The mechanical properties of alloys of the Ti-Al-Nb system after sintering show abnormally low values of strength and ductility (less than 150 MPa). Two-stage heat treatment of alloys of the Ti-Al-Nb system leads to the decomposition of large precipitates of TiAl3 with the formation of O-phase nuclei, as well as to the complete dissolution of unreacted niobium and AlNb2 phases. Heat treatment of alloys of the Ti-Al-Nb system contributes to an increase in its strength by approximately 10 times (1310 MPa, MA-180), and ductility by 2 times (1322 MPa, MA-20). The surface fracture of samples obtained after testing is characterized by intergranular (intercrystalline) brittle fracture with “river” or “step” features.
high-temperature treatment , intermetallic compound , mechanical properties , microstructure , spark-plasma sintering , Ti-Al-Nb , titanium aluminides
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National Nuclear Center of the Republic of Kazakhstan, Kurchatov, KZ-071100, Kazakhstan
Institute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov, KZ-071100, Kazakhstan
National Nuclear Center of the Republic of Kazakhstan
Institute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan
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