Details

Autor(en) / Beteiligte

• Yao, X.
• Zheng, Y.F.
• Quadir, M.Z.
• C.Kong
• Liang, J.M.
• Chen, Y.H.
• P.Munroe
• Zhang, D.L.

Titel

Grain growth and recrystallization behaviors of an ultrafine grained Al-0.6 wt%Mg-0.4 wt%Si-5vol.%SiC nanocomposite during heat treatment and extrusion

Ist Teil von

• Journal of alloys and compounds, 2018-05, Vol.745, p.519-524

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A bulk ultrafine grained Al-0.6 wt%Mg-0.4 wt%Si-5vol.%SiC nanocomposite was fabricated by spark plasma sintering (SPS) of a corresponding nanocrystalline metal matrix nanocomposite powder produced by high energy mechanical milling. The as-SPSed samples were either heat treated or hot extruded at 500 °C. Microstructural characterization of the samples revealed that the ultrafine Al(Mg,Si) grains in the as-SPSed sample grew slightly and underwent recovery during heat treatment, and dynamic recrystallization, rapid grain growth and grain boundary dragging of SiC nanoparticles occurred during extrusion. The Al(Mg,Si) grain growth and grain boundary dragging of the SiC nanoparticles during extrusion resulted in aggregation of a large fraction of the SiC nanoparticles which in turn caused formation of regions with finer and coarser Al(Mg, Si) grains respectively. •Microstructures of ultrafine grained Al(Mg,Si) matrix nanocomposite samples are studied.•The Al(Mg,Si) matrix undergoes recovery and limited growth during heat treatment.•Recrystallization and rapid grain growth of the Al(Mg,Si) matrix occur during extrusion.•A large fraction of the SiC nanoparticles aggregate during extrusion.•The Al(Mg,Si) grain sizes in local regions change inversely with the content of SiC nanoparticles.