Alloy powder, preparation method therefor, and use therefor

A method for preparing a metal material composed of endogenous alloy powder and wrapping body, which is prepared by the following steps:

• at step 1:
• melting initial alloy melt with the main elementary composition of Ma0Ab0Tc0, wherein a0, b0, and c0 represent the atomic percent contents of corresponding constituent elements respectively, and a0+b0+c0=100%, and 0<c0<15%;
• at step 2:
• solidifying the Ma0Ab0Tc0 initial alloy melt into a solid state, thus obtaining dispersed Ma1Ab1Tc1 particle phase endogenously precipitated from the melt and Ab2Tc2 matrix phase wrapping the dispersed particles, the as-obtained solid material is the metal material composed of endogenous alloy powder and wrapping body;
• among which 0<c1<c0<c2, it means that the content of element T in the Ma0Ab0Tc0 initial alloy melt is higher than that in the dispersed Ma1Ab1Tc1 particle phase, but lower than that in the Ab2Tc2 matrix phase;
• the metal material composed of endogenous alloy powder and wrapping body is prepared by solidification of the alloy melt, and the structure of the metal material includes the dispersed particle phase endogenously precipitated during the solidification of the initial alloy and the matrix phase wrapping the dispersed particles, which correspond to the endogenous alloy powder and the wrapping body, respectively;
• the major elementary composition of the endogenous alloy powder is Ma1Ab1Tc1, and the major element composition of the wrapping body is Ab2Tc2;
• both M and A contain one or more metal elements, T is an impurity element including oxygen, a1, b1, c1, b2, and c2 represent atomic percentage contents of the corresponding element respectively, and a1+b1+c1=100%, b2+c2=100%, c2>c1>0, b1>0;
• the melting point of the endogenous alloy powder is higher than that of the wrapping body;
• and
• the endogenous Ma1Ab1Tc1 alloy powder contains element A in a solid solution;
• the M and A comprise a pair or pairs of M1-A1 element combinations that will not form corresponding intermetallic compounds, wherein M1 represents any single element in M and A1 represents any single element in A, the main elements in M are composed of each M1 element that satisfies the combination conditions of M1-A1, and the main elements in A are composed of each A1 element that satisfies the combination conditions of M1-A1, so that the metal material composed of endogenous alloy powder and wrapping body will not form intermetallic compounds composed of the main elements in M and the main elements in A after being completely melted and re-solidified, but form an endogenous Ma1Ab1Tc1 alloy powder and a Ab2Tc2 wrapping body.