US2018010213A1PendingUtilityA1

Enhance ductility of gamma titanium aluminum alloys by reducing interstitial contents

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Assignee: UNITED TECHNOLOGIES CORPPriority: Jul 7, 2016Filed: Jul 7, 2016Published: Jan 11, 2018
Est. expiryJul 7, 2036(~10 yrs left)· nominal 20-yr term from priority
Inventors:Gopal Das
C22C 14/00C22C 1/00C22F 1/183
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Claims

Abstract

A process to increase ductility includes utilizing γ-TiAl alloy as a base alloy and reducing at least one interstitial of the base alloy to create an alloy compositions with extremely low interstitials (Eli).

Claims

exact text as granted — not AI-modified
What is claimed: 
     
         1 . A process to increase ductility, comprising:
 utilizing γ-TiAl alloy as a base alloy; and   reducing at least one interstitial of the base alloy to create an alloy compositions with extremely low interstitials (Eli).   
     
     
         2 . The process as recited in  claim 1 , further comprising reducing the at least one interstitial of the base alloy to less than about 200 wppm. 
     
     
         3 . The process as recited in  claim 1 , wherein utilizing γ-TiAl alloy as a base alloy includes utilizing a beta stabilized gamma γ-TiAl alloy 
     
     
         4 . The process as recited in  claim 1 , wherein utilizing γ-TiAl alloy as a base alloy includes utilizing TNM. 
     
     
         5 . The process as recited in  claim 4 , wherein the TNM has a composition of Ti-43.5Al-4Nb-1Mo-0.2B (all in at %). 
     
     
         6 . The process as recited in  claim 1 , wherein utilizing γ-TiAl alloy as a base alloy includes utilizing cast and Hot Isostatic Pressing (HIP'd) TNM γ-TiAl alloys. 
     
     
         7 . An alloy composition, comprising:
 a γ-TiAl alloy with at least one reduced interstitial of the base alloy to create an alloy compositions with extremely low interstitials (Eli).   
     
     
         8 . The alloy as recited in  claim 7 , wherein the at least one reduced interstitial is less than about 200 wppm. 
     
     
         9 . The alloy as recited in  claim 7 , wherein utilizing γ-TiAl alloy as a base alloy includes utilizing a beta stabilized gamma γ-TiAl alloy 
     
     
         10 . The alloy as recited in  claim 7 , wherein the γ-TiAl alloy is TNM. 
     
     
         11 . The alloy as recited in  claim 10 , wherein the TNM has a composition of Ti-43.5Al-4Nb-1Mo-0.2B (all in at %). 
     
     
         12 . The alloy as recited in  claim 7 , wherein the γ-TiAl alloy includes a cast and Hot Isostatic Pressing (HIP'd) TNM γ-TiAl alloy.

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