Mechanically induced reaction for solid-state synthesis of Mg2Si and Mg2Sn

Tatsuhiko Aizawa, Renbo Song

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Magnesium base compounds have unique properties as a functional material. The conventional melting and solidification and mechanical attriting/grinding methods have to suffer from various difficulties in synthesis of these compounds: large difference in melting temperature among elemental constituents and various contaminations in material processing. Bulk mechanical alloying (BMA) is attractive for solid-state synthesis of these types of magnesium compounds, especially Mg2X for X=Si and Sn. High dense, single phase Mg2X compact is successfully fabricated by this processing. Electrical conductivity of Mg2X is measured to describe its semi-conductivity. This solid-state reaction at room temperature is mechanically induced during BMA so that the solid-state reactivity is dependent on the physical properties of each element X. In the case of ductile-brittle phase system like Mg-Si, its solid reaction process is directly controlled by mechanical refinement of silicon particle size in the magnesium matrix. In the case of ductile-ductile phase system like Mg-Sn, its solid-state reactivity is enhanced by the repeated plastic flow of ductile constituents. The above mechanically induced solid-state reaction process is described with consideration of formation enthalpy ratio in Mg-X system varying during BMA. Transient behavior of thermoelectricity from metallic state to semi-conductive one is also described by the simple mixture rule of this formation enthalpy ratio.

Original languageEnglish
Pages (from-to)382-391
Number of pages10
JournalIntermetallics
Volume14
Issue number4
DOIs
Publication statusPublished - 2006 Apr

Keywords

  • A. Silicides, various
  • B. Thermoelectric properties
  • C. Plastic Summing, cold
  • C. Powder metallurgy, including consolidation
  • C. Sinteming

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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