Mechanical behavior of alloys with equiaxed microstructure in the semisolid state at high solid content

Journal Article · Fri Jan 15 04:00:00 EST 1999 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00356-5· OSTI ID:329053

Tzimas, E; Zavaliangos, A ^[1]

---

1. Drexel Univ., Philadelphia, PA (United States). Dept. of Materials Engineering

The mechanical response in compression of A2014 and Al-4 wt% Cu alloys with equiaxed microstructure in the semisolid state at high volume fraction of solid (>0.6) is studied. When the amount of liquid is low, deformation in compression is highly non-uniform due to strain localization. In the range of conditions examined no phase segregation was detected. The stress-strain curve exhibits a peak at low strain, around 5--10%, and then decreases to a plateau value. Secondary phase particles in A2014 that remain solid in the semisolid range of the alloy are responsible for the lower peak and higher plateau stress compared to Al-4 Wt% Cu alloy. The effect of the grain size for the alloys tested was small. Strain rate jump experiments show that the instantaneous strain rate sensitivity in the semisolid state is similar to that of the solid phase. As the volume fraction of solid decreases, the plateau stress becomes rate insensitive to the strain rate jump. The results allow the relative importance to be assessed of various mechanisms responsible for resistance to flow of semisolid alloys with equiaxed microstructure in compression.

• OSTI ID: 329053
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 2 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
CHEMICAL COMPOSITION
COMPRESSION STRENGTH
LIQUID METALS
MATHEMATICAL MODELS
MICROSTRUCTURE
MORPHOLOGY
STRAIN RATE
THIXOTROPY