The effect of microstructure evolution on the elevated temperature mechanical properties in Mg-Sn-Ca system

Do Hyung Kim, Ju Youn Lee, Hyun Kyu Lim, Joon Seok Kyeong, Won Tae Kim, Do Hyang Kim

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The effect of microstructural evolution on the creep properties in Mg-Sn-Ca system has been investigated. As-cast microstructure of Mg-Sn-Ca alloy consists of two or three phases depending on the Ca/Sn ratio, i.e. Mg2Sn, CaMgSn and Mg2Ca phases. Ternary CaMgSn phase has two types of morphology by its pseudo hyper-eutectic reaction with α-Mg; coarse rod-like primary or feather-like eutectic phase. Primary solidified CaMgSn phase exhibit negative effect on the tensile properties in spite of its high thermal stability up to 500°C. According to the creep test results, apparent stress exponent value (n = 7) indicates climb controlled creep mechanism by core diffusion above 150°C. Activation energy of Mg-5Sn-2Ca alloy (74 kJ/mol) is close to grain boundary diffusion for pure magnesium, 92 kJ/mol. Creep resistance is remarkably improved with the presence of Mg2Ca phase.

Original languageEnglish
Pages (from-to)2405-2413
Number of pages9
JournalMaterials Transactions
Volume49
Issue number10
DOIs
Publication statusPublished - 2008 Oct 1

Fingerprint

eutectics
Creep
mechanical properties
creep properties
creep tests
creep strength
Mechanical properties
Eutectics
microstructure
Microstructure
tensile properties
magnesium
casts
Creep resistance
thermal stability
rods
grain boundaries
Microstructural evolution
exponents
activation energy

All Science Journal Classification (ASJC) codes

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

Cite this

Kim, Do Hyung ; Lee, Ju Youn ; Lim, Hyun Kyu ; Kyeong, Joon Seok ; Kim, Won Tae ; Kim, Do Hyang. / The effect of microstructure evolution on the elevated temperature mechanical properties in Mg-Sn-Ca system. In: Materials Transactions. 2008 ; Vol. 49, No. 10. pp. 2405-2413.
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The effect of microstructure evolution on the elevated temperature mechanical properties in Mg-Sn-Ca system. / Kim, Do Hyung; Lee, Ju Youn; Lim, Hyun Kyu; Kyeong, Joon Seok; Kim, Won Tae; Kim, Do Hyang.

In: Materials Transactions, Vol. 49, No. 10, 01.10.2008, p. 2405-2413.

Research output: Contribution to journalArticle

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