Glass forming ability and mechanical properties of misch metal-based bulk metallic glass matrix composite

Ji Hun Kim, Joo Yun Lee, Jin Man Park, Eric Fleury, Won Tae Kim, Do Hyang Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effect of replacement of lanthanide by misch metal (Mm) in La-Al-TM (TM; transition metal, Ni, Cu and Co) alloys has been investigated to evaluate the possibility of fabrication of in-situ glass matrix composites with enhanced properties. For the as-cast cylindrical Mm55Al25Ni 10Cu10 alloy ingot with 3 mm diameter, the microstructure is consisted of two kinds of a few um size crystalline phases (volume fraction: 4.6%) uniformly distributed in the metallic glass matrix. The substitution of La by Mm reduces the glass forming ability (GFA), i.e., lower the reduced glass transition temperature, Trg (= Tg/TL, where TL is the liquidus temperature) and smaller superliquid temperature region, ΔTx (= Tx - Tg, where, T g is the glass transition temperature and Tx the onset temperatures of crystallization), enabling the fabrication of in-situ BMG matrix composite. The Mm55Al25Ni10Cu10 metallic glass matrix composite sample exhibits the compressive fracture strength of 931 MPa, and in particular enhanced the compressive plastic strain of 1.2% before failure. The enhanced strength and ductility was explained by the presence of fine crystalline phases embedded in the BMG matrix, which led to a multiple shear band formation.

Original languageEnglish
Pages (from-to)1395-1399
Number of pages5
JournalMaterials Transactions
Volume45
Issue number4
DOIs
Publication statusPublished - 2004 Apr 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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