Ni-based single crystal super alloy

Abstract

The object of the present invention is to provide an Ni-based single crystal super alloy capable of improving strength by preventing precipitation of a TCP phase at high temperatures. This object is achieved by an Ni-based single crystal super alloy having a composition consisting of 5.0-7.0 wt % Al, 4.0-8.0 wt % Ta, 2.9-4.5 wt % Mo, 4.0-8.0 wt % W, 3.0-6.0 wt % Re, 0.01-0.50 wt % Hf, 2.0-5.0 wt % Cr, 0.1-15.0 wt % Co and 1.0-4.0 wt % Ru in terms of its weight ratio, with the remainder consisting of Ni and unavoidable impurities.

What is claimed is:  
     
         1 . An Ni-based single crystal super alloy having a composition consisting of 5.0-7.0 wt % Al, 4.0-8.0 wt % Ta, 2.9-4.5 wt % Mo, 4.0-8.0 wt % W, 3.0-6.0 wt % Re, 0.01-0.50 wt % Hf, 2.0-5.0 wt % Cr, 0.1-15.0 wt % Co and 1.0-4.0 wt % Ru in terms of its weight ratio, with the remainder consisting of Ni and unavoidable impurities.  
     
     
         2 . An Ni-based single crystal super alloy having a composition consisting of 5.0-7.0 wt % Al, 4.0-6.0 wt % Ta, 1.0-4.5 wt % Mo, 4.0-8.0 wt % W, 3.0-6.0 wt % Re, 0.01-0.50 wt % Hf, 2.0-5.0 wt % Cr, 0.1-15.0 wt % Co, and 1.0-4.0 wt % Ru in terms of weight ratio, with the remainder consisting of Ni and unavoidable impurities.  
     
     
         3 . An Ni-based single crystal super alloy having a composition consisting of 5.0-7.0 wt % Al, 4.0-6.0 wt % Ta, 2.9-4.5 wt % Mo, 4.0-8.0 wt % W, 3.0-6.0 wt % Re, 0.01-0.50 wt % Hf, 2.0-5.0 wt % Cr, 0.1-15.0 wt % Co and 1.0-4.0 wt % Ru in terms of weight ratio, with the remainder consisting of Ni and unavoidable impurities.  
     
     
         4 . The Ni-based single crystal super alloy according to  claim 1  that has a composition consisting of 5.9 wt %, Al, 5.9 wt % Ta, 2.9 wt % Mo, 5.9 wt %, W, 4.9 wt % Re, 0.10 wt % Hf, 2.9 wt % Cr, 5.9 wt % Co and 2.0 wt % Ru in terms of weight ratio, with the remainder consisting of Ni and unavoidable impurities.  
     
     
         5 . The Ni-based single crystal super alloy according to  claim 2  that has a composition consisting of 5.9 wt % Al, 5.9 wt % Ta, 2.9 wt % Mo, 5.9 wt % W, 4.9 wt % Re, 0.10 wt % Hf, 2.9 wt % Cr, 5.9 wt % Co and 2.0 wt % Ru in terms of weight ratio, with the remainder consisting of Ni and unavoidable impurities.  
     
     
         6 . The Ni-based single crystal super alloy according to  claim 3  that has a composition consisting of 5.9 wt %, Al, 5.9 wt % Ta, 2.9 wt % Mo, 5.9 wt % W, 4.9 wt % Re, 0.10 wt % Hf, 2.9 wt % Cr, 5.9 wt % Co and 2.0 wt % Ru in terms of weight ratio, with the remainder consisting of Ni and unavoidable impurities.  
     
     
         7 . The Ni-based single crystal super alloy according to  claim 1  wherein, when the lattice constant of the matrix is taken to be al and the lattice constant of the precipitation phase is taken to be a2, a2≦0.999a1.  
     
     
         8 . The Ni-based single crystal super alloy according to  claim 2  wherein, when the lattice constant of the matrix is taken to be al and the lattice constant of the precipitation phase is taken to be a2, a2≦0.999a1.  
     
     
         9 . The Ni-based single crystal super alloy according to  claim 3  wherein, when the lattice constant of the matrix is taken to be al and the lattice constant of the precipitation phase is taken to be a2, a2≦0.999a1.  
     
     
         10 . The Ni-based single crystal super alloy according to  claim 4  wherein, when the lattice constant of the matrix is taken to be al and the lattice constant of the precipitation phase is taken to be a2, a2≦0.999a1.  
     
     
         11 . The Ni-based single crystal super alloy according to  claim 5  wherein, when the lattice constant of the matrix is taken to be al and the lattice constant of the precipitation phase is taken to be a2, a2≦0.999a1.  
     
     
         12 . The Ni-based single crystal super alloy according to  claim 6  wherein, when the lattice constant of the matrix is taken to be al and the lattice constant of the precipitation phase is taken to be a2, a2≦0.999a1.