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Mechanical properties and thermal stability of hot-rolled Al–15%B4C composite sheets containing Sc and Zr at elevated temperature

Qin Jian, Zhang Zhan et Chen X-Grant. (2017). Mechanical properties and thermal stability of hot-rolled Al–15%B4C composite sheets containing Sc and Zr at elevated temperature. Journal of composite materials, 51, (18), p. 2643-2653.

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URL officielle: https://doi.org/10.1177/0021998316674351

Résumé

The microstructure, mechanical properties, thermal stability and tensile fracture of two hot-rolled Al-15 vol.% B4C composite sheets (S40 with 0.4 wt.% Sc and SZ40 with 0.4 wt.% Sc and 0.24 wt.% Zr) were investigated. During multi-pass hot rolling, coarse Al3Sc or Al3(Sc, Zr) precipitations appeared and resulted in the loss of most of their hardening effect. In an appropriate post-rolling heat treatment, the hot-rolled sheets regained a significant precipitation hardening because of the precipitation of fine nanoscale Al3Sc and Al3(Sc,Zr) that uniformly distributed in the aluminum matrix. After the peak aging, the ultimate tensile strength at ambient temperature of the S40 and SZ40 sheets can reach 198 MPa and 215 MPa, respectively. During 2000 h of annealing at 300℃, the strengths at ambient temperature of both S40 and SZ40 composite sheets slowly decreased with increasing annealing time. However, the tensile strengths at 300℃ of both S40 and SZ40 composite sheets remained nearly unchanged and were less sensitive to the annealing time and more tolerable for precipitate coarsening, which demonstrated an excellent long-term thermal stability of both materials at elevated temperature. The tensile fracture at ambient temperature of both S40 and SZ40 composite sheets was dominated by the brittle B4C particle fracture, whereas the interfacial decohesion of B4C particles became the prominent characteristic of the fracture at 300℃.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:51
Numéro:18
Pages:p. 2643-2653
Version évaluée par les pairs:Oui
Date:1 Août 2017
Sujets:Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Génie > Génie mécanique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:Al-B4C composites, mechanical properties, thermal stability, post-rolling heat treatment, fracture, Matériaux composites Al-B4C, propriétés mécaniques, stabilité thermique, traitement thermique post-laminage, fracture
Déposé le:24 août 2017 13:30
Dernière modification:24 août 2017 13:30
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