Effect of feedstock geometry on the semisolid processing of Al-Si-Cu-Mg alloy

Research output: Contribution to journalArticle

Abstract

Shaping a metal by thixoforming involves feedstock preparation and reheating. Proper procedure and accurate processing criteria for thixoforming are required to provide a quality product. Appropriate parameters are crucial in assessing the capabilities of this thixoforming process. In this study, the effect of different billet geometry of Al-Si-Cu-Mg alloy on microstructure and mechanical properties were investigated. The billet with different geometries of height-to-diameter ratio (h0/d0 = 3.2 and h0/d0 = 0.8) was utilized through the cooling slope casting technique and thixoformed after being heated into compression press. The results indicate that low h0/d0 ratio produced the finest grain size for the α Al solid phase (≈52.8 5.1 μm), best shape factor and complete die filling. By contrast, high h0/d0 ratio produced coarser grain size for the α Al solid phase (≈62.2 6.1 μm), insufficient die filling, cold shut and shrinkage porosity defect. Moreover, the thixoformed billets with the lower h0/d0 ratio exhibited higher tensile stresses. The ultimate tensile strength, yield strength, and elongation to fracture of the thixoformed h0/d0 ratio 3.2 improved at 183 MPa, 163 MPa, and 1.6%, respectively, whereas the values of the thixoformed h0/d0 ratio 1.25 alloy were 206 MPa, 193 MPa, and 2.5%, respectively.

Original languageEnglish
Article number0865I2
JournalMaterials Research Express
Volume6
Issue number8
DOIs
Publication statusPublished - 21 Jun 2019

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Feedstocks
Geometry
Processing
Tensile stress
Yield stress
Elongation
Casting
Compaction
Tensile strength
Porosity
Metals
Cooling
Mechanical properties
Defects
Microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Effect of feedstock geometry on the semisolid processing of Al-Si-Cu-Mg alloy. / Samat, Saziana; Omar, Mohd. Zaidi; Intan Fadhlina, Mohamed.

In: Materials Research Express, Vol. 6, No. 8, 0865I2, 21.06.2019.

Research output: Contribution to journalArticle

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