Enhanced Microhardness and Conductivity in a Heat-Resistant Al-Er-Zr Alloy via Optimized Thermomechanical Processing
Chengxi Xie, Jingyang Li, Yi Lu, Shengping Wen, Shangshang Liang, Wu Wei, Xiaolan Wu, Hui Huang, Kunyuan Gao, Zuoren Nie
TL;DR
This study improves the heat resistance and conductivity of an aluminum alloy by optimizing aging and deformation treatments.
Contribution
The novel contribution is the discovery of optimal thermomechanical processing to enhance the alloy's properties.
Findings
Peak aging at 425 °C forms 4 nm Al3(Er1−xZrx) precipitates with high hardness and conductivity.
Synergistic treatment of 425 °C aging and 60% deformation yields optimal properties.
The alloy retains stability for ~40 years at 227 °C based on Arrhenius model extrapolation.
Abstract
To meet the demand for high-performance heat-resistant aluminum alloy conductors in energy transmission, this study systematically explores the effects of synergistic aging and deformation treatment on the microstructure, mechanical properties, and heat resistance of Al-0.04Er-0.08Zr alloy. Through isochronous/isothermal aging, rolling with varying deformation amounts, and microstructural characterization coupled with performance testing, the following findings emerged: 425 °C represents the peak aging temperature, at which a dispersed L12 structure of Al3(Er1−xZrx) composite precipitates with an average size of 4 nm is formed; Dispersed L12 structure Al3(Er1−xZrx) composite precipitation phase achieved an alloy hardness of 49.45 HV and electrical conductivity of 58.68% IACS; the synergistic treatment of peak aging (425 °C) with 60% deformation amount yielded optimal comprehensive…
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Taxonomy
TopicsAluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties