Microstructure-Strengthening Interrelationship of an Ultrasonically Treated Hypereutectic Al–Si (A390) Alloy

Soo Bae Kim, Young Hee Cho, Jae Gil Jung, Woon Ha Yoon, Young-Kook Lee, Jung Moo Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ultrasonic melt treatment (UST) was applied to an A390 hypereutectic Al–Si alloy in a temperature range of 750–800 °C and its influence on the solidification structure and the consequent increase in strength was investigated. UST at such a high temperature, which is about 100 °C above the liquidus temperature, had little effect on the grain refinement but enhanced the homogeneity of the microstructure with the uniform distribution of constituent phases (e.g. primary Si, α-Al and intermetallics) significantly refined. With the microstructural homogeneity, quantitative analysis confirmed that UST was found to suppress the formation of Cu-bearing phases, i.e., Q-Al5Cu2Mg8Si6, Al2Cu phases that form in the final stage of solidification while notably increasing the average Cu contents in the matrix from 1.29 to 2.06 wt%. A tensile test exhibits an increase in the yield strength of the as-cast alloy from 185 to 208 MPa, which is mainly associated with the solute increment within the matrix. The important role of UST in the microstructure evolution during solidification is discussed and the mechanism covering the microstructure-strengthening interrelationship of the ultrasonically treated A390 alloy is proposed.

Original languageEnglish
Pages (from-to)1376-1385
Number of pages10
JournalMetals and Materials International
Volume24
Issue number6
DOIs
Publication statusPublished - 2018 Nov 1

Fingerprint

ultrasonics
Ultrasonics
solidification
Solidification
microstructure
Microstructure
homogeneity
Bearings (structural)
cast alloys
Grain refinement
liquidus
Strengthening (metal)
yield strength
matrices
tensile tests
Temperature
quantitative analysis
Intermetallics
intermetallics
Yield stress

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kim, Soo Bae ; Cho, Young Hee ; Jung, Jae Gil ; Yoon, Woon Ha ; Lee, Young-Kook ; Lee, Jung Moo. / Microstructure-Strengthening Interrelationship of an Ultrasonically Treated Hypereutectic Al–Si (A390) Alloy. In: Metals and Materials International. 2018 ; Vol. 24, No. 6. pp. 1376-1385.
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Microstructure-Strengthening Interrelationship of an Ultrasonically Treated Hypereutectic Al–Si (A390) Alloy. / Kim, Soo Bae; Cho, Young Hee; Jung, Jae Gil; Yoon, Woon Ha; Lee, Young-Kook; Lee, Jung Moo.

In: Metals and Materials International, Vol. 24, No. 6, 01.11.2018, p. 1376-1385.

Research output: Contribution to journalArticle

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