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Precipitation Behavior of Spherical γ′ Phase in Eutectic Area of Ni 3 Al‐Based Alloy
Author(s) -
Xia Xing Chuan,
Peng Yuan Yi,
He Xin,
Li Chong,
Ding Jian,
Jiang Shan,
Liu Yong Chang
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201801318
Subject(s) - eutectic system , materials science , alloy , precipitation , microstructure , phase (matter) , metallurgy , carbide , work (physics) , thermodynamics , chemistry , physics , organic chemistry , meteorology
Understanding and mastering initial status in eutectic area (γ′–γ) of Ni 3 Al‐based alloy under solution treatment conditions are beneficial to its aging treatment and applications. In this work, optimal solution treatment process parameters of JG4246A Ni 3 Al‐based alloy are investigated based on microstructure observation, chemical composition analysis, and micro‐hardness test. Results show that the alloy with solution temperature of 1270 °C for 6 h possess smoother eutectic area (γ′–γ) boundaries, more stable carbides, and relatively higher micro‐hardness. More importantly, to clarify the evolution behavior of Ni 3 Al (γ′) phase in eutectic area (γ′–γ) under solution treatment conditions, short‐time (3 h) and long‐time (18 h) solution treatments at 1270 °C are applied and the evolution behavior is analyzed by TEM. Results show that plenty of spherical Ni 3 Al (γ′) phase appears in eutectic area (γ′–γ), with its dimensions changing little with solution time increasing. Vacancies, lattice distortion, and thermo‐stress mainly contribut to the precipitation and growth of spherical Ni 3 Al (γ′) phase.