Influence of hydrogen on microstructure and mechanical properties of alloys based on Ni3Al

• Published in: Journal of alloys and compounds Vol. 378; no. 1-2; pp. 279 - 284
• Main Authors: LOSERTOVA, Monika, GEMPERLOVA, Juliana, GEMPERLE, Antonin
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Lausanne Elsevier 22.09.2004
• Subjects: Condensed matter: structure, mechanical and thermal properties; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Nickel base alloys; Scanning electron microscopy; Ultimate strength method; Ruptures; Intermetallic compounds; Doping; Tensile tests; Mechanical properties; Dislocation structure; Intermetallics; High temperature alloys; Tensile strength; Strain; Transmission electron microscopy; Aluminium alloys; Yield strength; Hydrogen charging; Microstructure; Transition element alloys; Strain rate; Zirconium alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2003.10.068

The hydrogen-induced effect on mechanical properties, fracture features and on deformation structures in intermetallic alloys based on Ni3Al was studied. Four different sets of tensile specimens were prepared: binary, binary and charged by hydrogen, B and Zr-doped and B and Zr-doped and charged by hydrogen. Hydrogen was introduced at 800C in flowing hydrogen. The tensile tests were performed at room temperature and at strain rate of 5.8 x 10-5S-1. Yield strength of the binary specimens exhibited increase of 38% due to hydrogen effect and ultimate tensile strength decreased by 19%. A similar trend of the hydrogen effect was observed for B and Zr-doped alloys. The yield stress increased by 8% and the tensile strength decreased by 26%. The fracture features and the dislocation structures resulting from scanning electron microscopy (SEM) and TEM observations, respectively, were affected by the presence of hydrogen in binary and B and Zr-doped alloys. Macroscopic and microscopic strengthening effects of hydrogen are discussed.