Effect of Vanadium and Zirconium Additions on Mechanical Properties and Microstructure of Gravity Die-Cast AlSi9Cu2 Alloy Cylinder Heads


Kilinc E., Kiremitci N., Birol Y., DOKUMACI ALKAN E.

INTERNATIONAL JOURNAL OF METALCASTING, vol.13, no.1, pp.137-145, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 1
  • Publication Date: 2019
  • Doi Number: 10.1007/s40962-018-0238-z
  • Journal Name: INTERNATIONAL JOURNAL OF METALCASTING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.137-145
  • Keywords: aluminium alloys, automotive, microstructure, mechanical properties, GRAIN-REFINEMENT, TENSILE PROPERTIES, THERMAL-STABILITY, MG, CU, ZR, BEHAVIOR, TI, PRECIPITATION, ELEMENTS
  • Dokuz Eylül University Affiliated: Yes

Abstract

Systematic work was performed in the present study to investigate the effect of V and Zr additions on microstructural evolution and mechanical properties of the gravity die-cast AlSi9Cu2 alloy in T6 temper. The equiaxed dendritic structure typical of AlSi9Cu2 alloy is replaced by a much finer columnar dendritic network when modified with V and Zr additions. This remarkable structural refinement is believed to be linked with the formation of the V- and Zr-containing phases that form during solidification. The co-addition of V and Zr affects the tensile properties and hardness more significantly than individual additions. While the increase in strength is accompanied by a decrease in elongation, the penalty to be paid, particularly in the case of co-addition of V and Zr, is rather small and thus could be tolerated for the superior strength in some applications.