Semi-solid deformation in multi-component nickel aluminide View Full Text


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Article Info

DATE

1993-01-01

AUTHORS

C. S. Lin, J. A. Sekhar

ABSTRACT

A systematic study was carried out to determine the solidification and the tensile behaviour of semi-solid multicomponent nickel aluminide. Directionally solidified samples were tested at various temperatures in the mushy (semi-solid) region. A special Gleeble testing procedure was developed where transverse and longitudinal (5 mm) samples were quickly raised to a predetermined temperature in the semi-solid zone and fractured. The fracture stresses were found to decrease monotonically with temperature. The strain to fracture exhibited a ductility minimum at an intermediate temperature in the semi-solid zone. The effect of the solidification process variables, namely, the temperature gradient and velocity, on the fracture stress in the transverse direction was to increase the fracture stress at a given temperature. In the longitudinal direction, the fracture stress decreases with the temperature gradient and was relatively independent of velocity. At the temperature corresponding to the strain minimum, residual microcracks were detected on the fracture surface. The upper hot tearing temperature was noted to be a function of the solidification variables. The amount of strain accommodation and the hot tearing resistance was found to be influenced by the solidification microstructure. Fracture maps which include the transverse fracture stress, temperature, and temperature gradient during solidification (σT-T-G) for the directionally solidified microstructures are presented. A castability map is created from the fracture data. More... »

PAGES

3885-3894

References to SciGraph publications

  • 1984-01. Compression of semi-solid dendritic Sn-Pb alloys at low strain rates in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1977-09. Die thermal behavior in machine casting of partially solid high temperature alloys in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1979-06. Formation of longitudinal, midface cracks in continuously-cast slabs in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1993-07. Semi-solid deformation in multi-component nickel aluminide in JOURNAL OF MATERIALS SCIENCE
  • 1990. Solidification Microporosity in Equiaxed Multi-Component Nickel Aluminide in MRS ADVANCES
  • 1991-01. Solidification microporosity in directionally solidified multicomponent nickel aluminide in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1979-03. Refining by fractional solidification in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1981-03. Modeling of continuous strip production by rheocasting in METALLURGICAL AND MATERIALS TRANSACTIONS B
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    http://scigraph.springernature.com/pub.10.1007/bf00353196

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