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Thermal fatigue resistance of discontinuously reinforced cast aluminum-matrix composites

  • J. Sobczak
  • N. Sobczak
  • P. Darlak
  • Z. Slawinski
  • R. Asthana
  • P. Rohatgi
Article

Abstract

The thermal fatigue resistance of AlSi alloys and discontinuously reinforced Al-matrix composites containing graphite, silicon carbide, and fly ash particulates, and short alumina (Saffil) fibers was characterized by measuring the total length of microcracks on gravity-cast and squeeze-cast test specimens as a function of number of thermal cycles (1000–5000 cycles, 270 K amplitude). In each thermal cycle, the test specimens were heated and stabilized in air at 375 °C, water quenched, and air stabilized. In all specimens, the total crack length on a specified region increased with increasing number of thermal cycles. Whereas among monolithic alloys, squeeze-cast Al-12SiCuNiMg alloy exhibited better resistance to thermal cracking than Al-25Si and Al-20SiNi alloys, among the composites, squeeze-cast Al-alumina and Al-fly ash composites exhibited the best thermal fatigue resistance. The theoretical estimates of the thermal fatigue resistance of these composites are consistent with the experimental observations.

Keywords

cast composites fly ash squeeze casting thermal expansion thermal fatigue 

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Copyright information

© ASM International 2002

Authors and Affiliations

  • J. Sobczak
    • 1
  • N. Sobczak
    • 1
  • P. Darlak
    • 1
  • Z. Slawinski
    • 2
  • R. Asthana
    • 3
  • P. Rohatgi
    • 4
  1. 1.Foundry Research InstituteKrakowPoland
  2. 2.Technical University of LublinLublinPoland
  3. 3.Manufacturing Engineering, Technology Dept.University of Wisconsin-StoutMenomonie
  4. 4.Materials DepartmentUniversity of Wisconsin-MilwaukeeMilwaukee

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