| 摘要 |
<p>A method is taught for rendering a boron-doped tri-nickel aluminide resistant to mechanical failure while at intermediate temperatures of 600°C to 800°C due to a hot-short phenomena. The method involves incorporating between 0.05 and 0.30 of cobalt in the composition according to the expression:
(Ni<Sub>1-x-z</Sub>Co<Sub>x</Sub>Al<Sub>z</Sub>)<Sub>100-y</Sub>B<Sub>y</Sub>.</p><p>The concentration of aluminum, z, is between 0.23 and 0.25 and the concentration of boron, y, is between 0.2 and 1.50 atomic percent. The composition is formed into a melt and the melt is rapidly solidified by atomization and consolidated. The consolidation may be simultaneous with the rapid solidification, as in spray forming, or sequential by atomization to a powder and consolidation of the powder by HIPping. The consolidated body is cold worked to increase the resistance of the body to failure at intermediate temperatures and may be annealed following the cold working. </p> |
