2results about How to "Increase volume fraction" patented technology

The application provides a B2 phase reinforced multi-principal element alloy for laser additive manufacturing and a preparation method thereof, and belongs to the technical field of metal laser additive manufacturing. By introducing Al elements and a small amount of W, Mo, Ta, V or Nb solid solution strengthening elements and trace amounts of B, Y, Ce, Zr or Hf grain boundary strengthening elements, a high volume fraction and excellent strengthening effect of fine B2 precipitated phases can be obtained without impairing the printability of the alloy laser additive manufacturing, the comprehensive mechanical properties of the B2 phase reinforced multi-principal element alloy are significantly improved, and the preparation of a new, high-performance and excellent printing performance B2 phase reinforced multi-principal element alloy by laser additive manufacturing is realized.

The invention discloses a 1.5 GPa-grade precipitation strengthening type multi-principal-element alloy and a heat treatment method thereof, and belongs to the technical field of novel metal materials. On the basis of an AlCrFeNi series FCC / B2 double-phase multi-principal-element alloy, a novel double-stage solid solution coupling aging heat treatment process which is simple in procedure and low in cost is developed. According to the process, a multi-level and multi-mode precipitated phase structure is introduced, and the mechanical property of the as-cast FCC / B2 double-phase multi-principal-element alloy is remarkably improved. The yield strength and the tensile strength of the alloy at the room temperature are up to 1050 MPa and 1567 MPa correspondingly, and the requirements of the aerospace field for high-strength and high-toughness metal materials are met. The heat treatment technology shows huge potential in the aspect of improving the comprehensive mechanical property of the FCC / B2 double-phase multi-principal-element alloy, and practical application of the alloy in the key fields of aero-engine components, rocket structural parts and the like can be powerfully promoted.