Influence of the Thermal-force Effect on the Process of High-temperature Synthesis of the NbAl Intermetallic Compound

摘要

In this work,the intermetallic compound Ni3Al was obtained by high-temperature synthesis under pressure at various values of the preliminary pressure on the initial powder mixture(3Ni+Al).The study of pressure-time and displacement-time diagrams gave a coherent picture of the synthesis passage over time.It was found that an increase of preliminary pressure leads to a decreasing of the powder compacts porosity.In this regard,the smallest displacement of the press plunger after initiating the synthesis reaction in the powder compact was observed at the highest value of the preliminary pressure on the compact.The role of preliminary pressure on the initial powder mixture in the process of the grain structure formation of the Ni3Al intermetallic compound synthesized under pressure was determined.