The effect of thermomechanical processing on the tensile, fatigue, and creep behavior of magnesium alloy AM60

Z. Chen, J. Huang, R. F. Decker, S. E. Lebeau, L. R. Walker, O. B. Cavin, T. R. Watkins, C. J. Boehlert

Research output: Contribution to journalArticle

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Abstract

Tensile, fatigue, fracture toughness, and creep experiments were performed on a commercially available magnesium-aluminum alloy (AM60) after three processing treatments: (1) as-THIXOMOLDED (as-molded), (2) THIXOMOLDED then thermomechanically processed (TTMP), and (3) THIXOMOLDED then TTMP then annealed (annealed). The TTMP procedure resulted in a significantly reduced grain size and a tensile yield strength greater than twice that of the as-molded material without a debit in elongation to failure (ε f ). The as-molded material exhibited the lowest strength, while the annealed material exhibited an intermediate strength but the highest ε f (>1 pct). The TTMP and annealed materials exhibited fracture toughness values almost twice that of the as-molded material. The as-molded material exhibited the lowest fatigue threshold values and the lowest fatigue resistance. The annealed material exhibited the greatest fatigue resistance, and this was suggested to be related to its balance of tensile strength and ductility. The fatigue lives of each material were similar at both room temperature (RT) and 423 K (150 °C). The tensile-creep behavior was evaluated for applied stresses ranging between 20 and 75 MPa and temperatures between 373 and 473 K (100 and 200 °C). During both the fatigue and creep experiments, cracking preferentially occurred at grain boundaries. Overall, the results indicate that thermomechanical processing of AM60 dramatically improves the tensile, fracture toughness, and fatigue behavior, making this alloy attractive for structural applications. The reduced creep resistance after thermomechanical processing offers an opportunity for further research and development.

LanguageEnglish (US)
Pages1386-1399
Number of pages14
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume42
Issue number5
DOIs
StatePublished - May 2011

Profile

magnesium alloys
Magnesium alloys
fracture strength
Creep
Fatigue of materials
Processing
tensile creep
creep strength
fatigue life
yield strength
research and development
ductility
Fracture toughness
aluminum alloys
tensile strength
elongation
grain boundaries
grain size
thresholds
room temperature

ASJC Scopus subject areas

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

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The effect of thermomechanical processing on the tensile, fatigue, and creep behavior of magnesium alloy AM60. / Chen, Z.; Huang, J.; Decker, R. F.; Lebeau, S. E.; Walker, L. R.; Cavin, O. B.; Watkins, T. R.; Boehlert, C. J.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 42, No. 5, 05.2011, p. 1386-1399.

Research output: Contribution to journalArticle

Chen, Z. ; Huang, J. ; Decker, R. F. ; Lebeau, S. E. ; Walker, L. R. ; Cavin, O. B. ; Watkins, T. R. ; Boehlert, C. J./ The effect of thermomechanical processing on the tensile, fatigue, and creep behavior of magnesium alloy AM60. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2011 ; Vol. 42, No. 5. pp. 1386-1399
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