Journal of Materials Science

, Volume 13, Issue 3, pp 571–579 | Cite as

Mechanical properties of unidirectionally transformed Cu-In alloys

  • B. G. Mellor
  • D. V. Edmonds


Comprehensive hardness measurements and limited tensile tests have been made on eutectoid and off-eutectoid Cu-In alloys. The alloys were transformed by unidirectional heat-treatment techniques using a range of imposed growth rates which resulted in alignment of the pearlite microstructure and a range of interlamellar spacing. Room temperature hardness of the as-transformed alloys was found to vary linearly as a function of λ−1/2, where λ is the pearlite interlamellar spacing; the alloys were calculated to have cooled from the decomposition temperature at rates in the range 0.047 to 18.6 K min−1, which could result in variations of precipitation/coarsening reactions in the pearlitic phases contributing towards strength, as well as the lamellae interfaces. Hardness was also measured as a function of temperature and indicated a change in strengthening mechanism at ∼550 K, thought to indicate the temperature above which no significant strengthening was contributed by the pearlitic interfaces. Tensile failure of the lamellar structure occurred in a manner identical to directionally aligned Al-CuAl2 eutectics.


Tensile Test Pearlite Lamellar Structure Hardness Measurement Strengthen Mechanism 
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Copyright information

© Chapman and Hall Ltd. 1978

Authors and Affiliations

  • B. G. Mellor
    • 1
  • D. V. Edmonds
    • 1
  1. 1.Department of Metallurgy and Materials ScienceUniversity of CambridgeCambridgeUK

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