The microstructure of the Ni47.5Al25Fe27.5 alloy was modified by adding Cr or Nb to improve its tensile properties. Increasing the Cr content increased the volume fraction of the interdendritic regions and, subsequently, increased the tensile elongation at room temperature. Additionally, adding Nb significantly improved the tensile properties of the Ni47.03Al24.75Fe27.23NB1 alloy, because the element Nb reduces the number of γ/β′ interfaces and strengthened both the γ and β′ phases and the γ/β′ interfaces. Both the as-annealed Ni47.03Al24.75Fe27.23Cr1 and Ni47.03Al24.75Fe27.23Nb1 alloys exhibited a tensile elongation at room temperature of over 10 pct. However, temperature strongly affected the tensile properties. The brittleness of the Ni47.03Al24.75Fe27.23Nb1 alloy was effectively inhibited because of its lower temperature sensitivity at moderate temperatures.
|Number of pages||10|
|Journal||Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science|
|State||Published - Jan 2006|