High temperature thermal and mechanical stability of high-strength nanotwinned Al alloys

Li, Qiang; Cho, Jaehun; Xue, Sichuang; Sun, Xing; Zhang, Yifan; Shang, Zhongxia; Wang, Haiyan; Zhang, Xinghang

doi:10.1016/j.actamat.2018.11.011

High temperature thermal and mechanical stability of high-strength nanotwinned Al alloys

Journal Article · Mon Nov 19 00:00:00 EST 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2018.11.011· OSTI ID:1612484

^[1]; Cho, Jaehun ^[2]; Xue, Sichuang ^[2]; Sun, Xing ^[2]; Zhang, Yifan ^[2]; ^[2]; Wang, Haiyan ^[2]; ^[2]

Purdue Univ., West Lafayette, IN (United States); DOE/OSTI
Purdue Univ., West Lafayette, IN (United States)

Al alloys have widespread applications, but often suffer from low yield strength. Recently, nanotwinned Al-Fe solid solution alloys have shown high flow stress (>1.5 GPa), ascribed to nanograins with abundant incoherent twin boundaries and solute-stabilized 9R phase. However, the high temperature mechanical behaviors of high-strength twinned Al-Fe alloys remain unknown. In this study, we show that nanotwinned microstructures are stable up to 280 °C, followed by recrystallization at 300 °C. In-situ uniaxial compression tests in a scanning electron microscope show that the nanotwinned Al alloys retain their high flow stress of ~1.3 GPa when tested up to 200 °C, and substantial softening occurs at a test temperature of 300 °C. This work reveals the superb thermal stability and high temperature mechanical behaviors of the nanotwinned Al-Fe alloys, and offers a new perspective to design future strong and thermally stable nanostructured Al alloys.

View Accepted Manuscript (DOE)

Research Organization:: Purdue University, West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016337

OSTI ID:: 1612484

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 165; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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