Development of a high-strength Al-Zn-Mg-Cu-based alloy via multi-strengthening mechanisms

We develop high-strength of Al-Zn-Mg-Cu-based alloys (7xxx series) by optimizing the amount of Mg/Cu with a trace addition of Sc. The highest mechanical properties are achieved with σUTS=672 MPa (σy=644 MPa) and ε=8.6%. Based on quantitative symmetry measurements, the improved mechanical strength or...

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Veröffentlicht in:	Scripta materialia 2021-12, Vol.205, p.114216, Article 114216
Hauptverfasser:	Won, Sung-Jae, So, Hyeongsub, Kang, Leeseung, Oh, Soong Ju, Kim, Kyou-Hyun
Format:	Artikel
Sprache:	eng
Schlagworte:	7xxx Series aluminum alloy Materials Science Materials Science, Multidisciplinary Mechanical properties Metallurgy & Metallurgical Engineering Microalloying Nanoscience & Nanotechnology Science & Technology Science & Technology - Other Topics Symmetry quantification Technology
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Zusammenfassung:	We develop high-strength of Al-Zn-Mg-Cu-based alloys (7xxx series) by optimizing the amount of Mg/Cu with a trace addition of Sc. The highest mechanical properties are achieved with σUTS=672 MPa (σy=644 MPa) and ε=8.6%. Based on quantitative symmetry measurements, the improved mechanical strength originates from nanoscopic structural distortion caused by the excessive solutes of Mg and Cu as the amount of Mg/Cu increases. In addition, Sc microalloying induces grain refinement, thus enhancing the mechanical properties. [Display omitted]
ISSN:	1359-6462 1872-8456
DOI:	10.1016/j.scriptamat.2021.114216