Effects of casting defects and microstructure on fatigue properties of cast Ag-Pd-Cu-Au-Zn alloy for dental applications

T. Mizumoto, M. Niinomi, T. Akahori, H. Fukui

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

Effects of the casting defects such as micro shrinkage, pore and surface roughness on fatigue properties of cast Ag-Pd-Cu-Au-Zn alloy were investigated in comparison with the fatigue properties of the drawn Ag-Pd-Cu-Au-Zn alloy in this study. Moreover, in this study, cast Ag-Pd-Cu-Au type alloys that were manufactured using a dental casting machine were conducted with two kinds of heat treatments. Fatigue tests were then carried out on these alloys. Relationship between microstructure and fatigue properties was also discussed. The fatigue strength of the cast Ag-Pd-Cu-Au-Zn alloy is considerably smaller than that of the drawn Ag-Pd-Cu-Au-Zn alloy. The size of the micro shrinkage affects the fatigue strength of this cast alloy strongly.The fatigue strength of heat treated cast alloy is greater than of as-cast alloy. The fatigue strength of this cast alloy can be raised by controlling its microstructure through heat treatments. The fatigue crack of the cast alloy initiates preferentiallyat the micro shrinkage near the specimen surface. The scatter of the fatigue strength of the cast alloy becomes to be small by relating the fatigue life with the maximumstress intensity factor calculated assuming the micro shrinkage that becomes to be a fatigue crack initiation site as a initial crack.

Original languageEnglish
Pages (from-to)3207-3212
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number4
DOIs
Publication statusPublished - 2003
Externally publishedYes
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 2003 Jul 72003 Jul 11

Keywords

  • Casting
  • Dental alloy
  • Fatigue
  • Silver alloy

ASJC Scopus subject areas

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

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