Elevated temperature aluminum-titanium alloy by powder metallurgy process
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsWilliam E. Frazier, Michael J. Koczak
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Abstract
An aluminum-titanium alloy and a process of making it, the alloy consisting ssentially of aluminum, 4-6 wt. % titanium, 1-2 wt. % carbon, and 0.1-0.2 wt % oxygen. The alloy is an aluminum matrix supersaturated with titanium, and having throughout a fine, homogeneous dispersion of Al.sub.3 Ti particles. It is fine grained and has grain boundary dispersoids of carbides and oxides, predominantly of aluminum. An aluminum-titanium melt is rapidly solidified and then mechanically alloyed in the presence of a carbon-bearing agent. The resulting powder is degassed and hot consolidated to form articles which exhibit high strength, ductility, and creep resistance at temperatures greater than 200.degree. C.
Claims30
An aluminum-titanium alloy exhibiting high strength at high temperatures and consisting essentially of, by weight, 3 to 20% titanium, 0.5 to 2.5% carbon, 0.05 to 4.0% oxygen, balance aluminum and other trace elements, said aluminum alloy being the product of a process comprising the steps of:
- preparing a melt of aluminum and 3 to 20 weight percent titanium;
- rapidly solidifying the melt at greater than or equal to 10.sup.4 .degree. C./sec to form a first powder;
- mechanically alloying the first powder in the presence of a sufficient amount of a carbon-bearing process control agent to provide the desired percent of carbon in said alloy, thereby producing a second powder;
- degassing said second powder at between 400.degree. C. and 450.degree. C. to remove moisture and volatile gases;
- and
- hot consolidating said degassed second powder at between 375.degree. C. and 425.degree. C.
An aluminum-titanium alloy exhibiting high strength at high temperatures and consisting essentially of, by weight, 4 to 6% titanium, 1 to 2% carbon, 0.1 to 0.2% oxygen, balance aluminum and other trace elements, said aluminum alloy being the product of a process comprising the steps of:
- preparing a melt of aluminum and 4 to 6 weight percent titanium;
- rapidly solidifying the melt at greater than or equal to 10.sup.4 .degree. C./sec to form a first powder;
- mechanically alloying the first powder in the presence of a sufficient amount of a carbon-bearing process control agent to provide the desired percent of carbon in said alloy, thereby producing a second powder;
- degassing said second powder at between 400.degree. C. and 450.degree. C. to remove moisture and volatile gases;
- and
- hot consolidating said degassed second powder at between 375.degree. C. and 425.degree. C.
An aluminum-titanium powder produced by a process comprising the steps of:
- preparing a melt of aluminum and 3 to 20 weight percent titanium;
- rapidly solidifying the melt at greater than or equal to 10.sup.4 .degree. C./sec to form a first powder;
- and
- mechanically alloying the first powder in the presence of a sufficient amount of a carbon-bearing process control agent to provide 0.5 to 2.5 weight percent carbon in said powder.
A process of making an aluminum-titanium alloy said process comprising the steps of:
- preparing a melt of aluminum and 3 to 20 weight percent titanium;
- rapidly solidifying the melt at greater than or equal to 10.sup.4 .degree. C./sec to form a first powder;
- mechanically alloying the first powder in the presence of a sufficient amount of a carbon-bearing process control agent to provide 0.5 to 2.5 weight percent carbon in said alloy, thereby producing a second powder;
- degassing said second powder at between 400.degree. C. and 450.degree. C. to remove moisture and volatile gases;
- and
- hot consolidating said degassed second powder at between 375.degree. C. and 425.degree. C.
Dependencies are inferred from the claim text.