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Effects of grain refinement on age hardening behavior and precipitation kinetics of Al–Si–Cu–Mg alloys
Author(s) -
Lu T.,
Tao S.,
Chen Y.,
Pan Y.,
Pi J.
Publication year - 2017
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.201600466
Subject(s) - materials science , nucleation , alloy , precipitation hardening , microstructure , precipitation , kinetics , metallurgy , grain boundary , hardening (computing) , grain size , casting , thermodynamics , crystallography , chemistry , composite material , physics , layer (electronics) , quantum mechanics , meteorology
The influences of grain refinement on precipitation kinetics were investigated for an Al–11 wt% Si–1.5 wt% Cu–0.3 wt% Mg casting alloy doped with B and and with La–B respectively by microstructure observation, hardness test and Johnson–Mehl–Avrami (JMA) equation. Co‐alloying of La–B facilitates the faster hardening response with higher hardness value for the alloy. The calculated Avarmi exponent indicates that the nucleation of θ′‐Al 2 Cu precipitates occurs on grain boundaries for the refined alloys. The activation energies for the precipitation are of 42 kJ/mol and 30 kJ/mol for B‐doped and La–B co‐doped alloys, respectively.