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Charakterisierung von unidirektional erstarrten Ni‐Al‐Mo Legierungen
Author(s) -
Ishak M.,
Takagi H.
Publication year - 2012
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201200975
Subject(s) - eutectic system , materials science , microstructure , quenching (fluorescence) , alloy , lamellar structure , phase (matter) , metallurgy , composite number , composite material , chemistry , physics , organic chemistry , quantum mechanics , fluorescence
The material composite was fabricated by the unidirectional solidification method in the eutectic composition alloy. Performing unidirectional solidification of Ni‐Al‐Mo alloy in eutectic composition produces γ phase ‐Ni and γ′ phase‐Ni 3 Al as a matrix, and the phase‐Mo growth into fibrous and lamellar‐like structure. The aim of this research was to study the characteristics of Ni‐Al‐Mo after various heat treatment conditions. The specimens were solution‐treated at temperatures of 1180°C and 1280°C, followed by water quenching. In addition, aging treatments were carried out at various temperatures (from 700°C to 1000°C) and at different time durations. The microstructure, mechanical properties and characteristics of non‐treated, solution‐treated and aging specimens were investigated. It was found that the mechanical properties of unidirectional solidified Ni‐Al‐Mo can be improved by solution treatment whilst the strength through performing an aging treatment. The optimized conditions were at 1280°C and 4 hours for water quenching (solution treatment), followed by an aging process at 800°C and 4 hours. These treatments led to an increase of mechanical properties due to uniformly precipitations of finely dispersed γ′ phase‐Ni 3 Al throughout the specimens.