Technique for Producing High Effective, Fast Modification and High Sr Content Al-Sr20 Master Alloy and its Application

Abstract:

This paper introduces a novel “direct reaction - hot extrusion” technique for producing high effective, fast modification and high Sr content Al-Sr20 master alloy. It mainly contains four processes: 1) Alloying by a medium-frequency induction furnace with complementary mechanical and electromagnetic stirring; 2) Degassing and deslagging by a rotary degassing method; 3) Casting coarse alloy bars; 4) Producing Al-20Sr master alloy wire by using a hot-extrusion process of large cross-section deformation. Microstructural characterizations revealed that the intermetallic Al4Sr phase in the Al-Sr20 alloy was homogeneously distributed in Al matrix with small size and roundish shapes, which ensured the master alloy wire exhibit advantages including high recovery, good reproducibility, no delitescence of modification, no corrosion on equipments, and good workability with smooth surface, no bubbles, no peeling and no cracking. This Al-Sr20 master alloy has been industrially applied in Al-Si alloys casting in automobiles and motorcycle wheels, etc.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 2361-2365
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.2361
• Online since: November 2011
• Authors: Jian Chun Chen, Cheng Wei Liao, Chun Xu Pan
• Keywords: Al-Sr Master Alloy, Direct Reaction Process, Direct Reaction-Hot Extrusion Process, Microstructure, Modification

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