An ultra-high strength and high ductility titanium alloy

Abstract

The invention discloses a super-high strength and high-plasticity titanium alloy, which is prepared from the following components in percentage by weight: 4%-6% of Al, 8%-11% of Mo, 2%-6% of V, 2%-5% of Cr, and the balance of Ti and inevitable impurities, wherein the tensile strength Rm of the super-high strength and high-plasticity titanium alloy at a room temperature is greater than or equal to 1500MPa; and the ductility A is greater than or equal to 10%. The titanium alloy disclosed by the invention contains a beta isomorphous stable element Mo with relatively high mass percent; the diffusion speed of the element Mo in the titanium alloy is slow, so that the size of a precipitated phase in the titanium alloy is small, and the titanium alloy has a relatively good heat treatment strengthening effect; an alpha phase can be dissolved and strengthened by the element V; meanwhile, the c / a ratio of the alpha phase is reduced; slippage of the alpha phase is facilitated; and the titanium alloy has relatively low creep resistance and good plasticity.

Description

technical field [0001] The invention belongs to the technical field of high-strength titanium alloys, in particular to an ultra-high-strength and high-plasticity titanium alloy. Background technique [0002] As a new type of light metal material developed in recent decades, titanium alloy is widely used in various fields of national economy because of its excellent properties such as non-magnetic, corrosion resistance, biocompatibility, temperature resistance and high specific strength. [0003] Traditional ultra-high strength titanium alloy (R m ≧1250MPa) is used as a structural part in aerospace, weapons, ships and other weaponry to manufacture various frame and beam load-bearing components, load-bearing bolts, high-strength springs, aircraft carrier catapults and armor, etc., to further improve the specific strength and ratio of titanium alloys Stiffness enables greater weight savings. In recent years, foreign countries have attached great importance to the research of ...

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Problems solved by technology

However, this improved design brings a loss of plasticity while making the titanium alloy have high strength. Taking Ti-5553 titanium alloy as an example, when its tensile strength is 1500MPa, it has almost no plasticity; The TB10 (Ti-5Mo-5V-2Cr-3Al) alloy developed by the Institute and the Ti-B19 (Ti-5Mo-5V-4Cr-2Zr-3Al) alloy developed by the Northwest Nonferrous Metal Research Institute belong to the category of high-strength structural titanium alloys. , these two alloys have good plasticity at the strength level of 1100MPa~1200MPa, but they also have the problem of low plasticity when the strength is higher than 1250MPa

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