Single-phase alpha magnesium-lithium alloy with excellent high-temperature mechanical performance and processing technique of single-phase alpha magnesium-lithium alloy

Abstract

The invention discloses single-phase alpha magnesium-lithium alloy with excellent high-temperature mechanical performance and a processing technique of the single-phase alpha magnesium-lithium alloy. The single-phase alpha magnesium-lithium alloy is prepared from the following ingredients by weight percent: 2.0 to 6.0 percent of Li, 0.2 to 0.4 percent of Ca, 0.1 to 0.3 percent of Hf, 0.1 to 0.3 percent of Mo, 0.1 to 0.4 percent of Pb, 0.1 to 0.2 percent of Th, and the balance of magnesium. The invention provides a solution of a novel materials science for the sharp decrease and worsening of mechanical performance of the magnesium-lithium alloy at about 100 DEG C. The material has the mechanical performance of the traditional magnesium-lithium alloy: the elastic modulus is 50 to 70 GPa, the yield strength is 90 to 120 MPa, the tensile strength is 140 to 160 MPa, and ductility is 6 to 18 percent. The single-phase alpha magnesium-lithium alloy has the high-temperature mechanical performance that the traditional magnesium-lithium alloy does not have: the yield strength is 140 to 150 MPa at a temperature lower than 100 DEG C, and the yield strength of the traditional magnesium-lithium alloy is 65 MPa at a temperature lower than 100 DEG C. While the high-temperature mechanical performance is ensured, the service life of the alloy is further prolonged, and the industrialized mass application is facilitated. The magnesium-lithium alloy of the invention can be used at the temperature lower than 100 DEG C and has a significant light-weight effect.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a magnesium-lithium alloy. Background technique [0002] Magnesium-lithium alloy, the lightest metal structure material in the world today, can be prepared by adding lithium to magnesium, and the density can reach 0.96-1.64g / cm according to the application 3 between. Magnesium-lithium alloy materials have excellent mechanical properties of low density, high specific stiffness, high specific strength, high damping performance of shock absorption and noise elimination, as well as anti-radiation and anti-electromagnetic interference performance, representing the technological frontier of magnesium alloy development, known as It is the most green and environmentally friendly revolutionary material for the future. The same size and weight of magnesium-lithium alloy is only half of that of aluminum alloy, but its specific strength is higher than that of aluminum alloy. Compared with ...

AI Technical Summary

Problems solved by technology

Generally cast magnesium-lithium alloys and deformed magnesium-lithium alloys are severely restricted in their application range due to high-temperature performance degradation.