Effect of Sc and Zr microalloying on recrystallization behavior of 1xxx aluminum heat exchanger alloys during post-deformation annealing
Alyaa Bakr, Paul Rometsch, X.-Grant Chen
TL;DR
This paper studies how adding small amounts of Sc and Zr affects the microstructure of aluminum alloys during high-temperature annealing, which is important for heat exchanger applications.
Contribution
The study reveals the enhanced recrystallization resistance of 1xxx aluminum alloys through Sc and Zr microalloying, particularly at high brazing temperatures.
Findings
The Al-0.19Sc-0.15Zr alloy showed the highest resistance to recrystallization due to fine Al3(Sc,Zr) precipitates.
Al-0.07Sc-0.10Zr retained grain stability up to 550°C but partially recrystallized at 575°C.
The base alloy fully recrystallized at 500°C and experienced abnormal grain growth at higher temperatures.
Abstract
1xxx-series aluminum alloys are widely utilized in heat exchangers. During brazing, heat exchanger components are exposed to a short period of high temperature, which may trigger recrystallization and abnormal grain growth, ultimately compromising their mechanical properties. This study investigates the impact of Sc and Zr microalloying on the microstructure stability of hot deformed 1xxx alloys subjected to post-deformation annealing from 500 to 575 °C for 1 h to simulate brazing-type processes. Four alloys were studied: namely 1xxx base, Al-0.07Sc, Al-0.07Sc-0.10Zr and Al-0.19Sc-0.15Zr alloys. Annealing at 500 °C led to complete recrystallization in the base alloy, while higher annealing temperatures promoted abnormal grain growth. The Al-0.07Sc alloy resisted recrystallization at 500 °C but was fully recrystallized by 550 °C. In contrast, the Al-0.07Sc-0.10Zr alloy retained its grain…
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Taxonomy
TopicsAluminum Alloy Microstructure Properties · Metallurgy and Material Forming · Microstructure and Mechanical Properties of Steels