Effect of Aging Time on Microstructure and Properties of Ni-W-Al-Ti High Density Alloy
A new Ni-W-Al-Ti high density alloy with density of 10.8 g·cm-3 was designed based on the face-centered cubic structure and the strengthening principle of fine dispersion phase.The test alloy was aged at 750 ℃ for different times(0,8,16,24,32 h).The effects of aging time on the microstructure and tensile properties of the alloy were studied.The results show that after aging,D1a type Ni4W and L12 type Ni3Al long range order strengthening phases were precipitated in Ni-W-Al-Ti high density alloy.With the extension of the aging time,the size of Ni4W phase increased and the shape changed from spherical to elliptic,and the quantity of Ni3Al phase increased.With the extension of aging time,the yield strength of the alloy increased first and then tended to be stable,the tensile strength had no obvious change,and the percentage elongation after fracture decreased.When the aging time was 24 h,the yield strength of the alloy was the highest of 740 MPa,the tensile strength;percentage elongation after fracture were moderate,which were 886 MPa and 9%,respectively;the comprehensive tensile property was relatively good.
high density alloyaging treatmentNi4W phaseNi3Al phasetensile property
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