Ge-containing low-quenching sensitive aluminum alloy

Abstract

The invention relates to a Ge-containing low-quenching sensitive aluminum alloy. Aluminum alloy is subjected to micro-Ge alloying treatment; based on the characteristic that binding energy of Ge element and vacancy is far more than that of elements of Zn, Mg, Cu and the like and the vacancy is utilized, the Ge element, when solid solution is quenched, is added into the inside of the alloy and is preferentially combined with the vacancy to prevent the diffusion of Zn, Mg, Cu and other solute atoms of the alloy at a low solid solution quenching speed and the precipitation of a coarse second phase; and therefore, the full hardening of the aluminum alloy is improved effectively, the quenching sensitivity of the aluminum alloy is reduced, and a quenching tissue with full solid solution is provided for obtaining dispersion-strengthened phase in subsequent aging. The Ge-containing low-quenching sensitive aluminum alloy can effectively reduce the quenching sensitivity of the aluminum alloy and improves the full hardening of the aluminum alloy, the saturation of the solute atom solid solution of the alloy at the low quenching speed and the mechanical property after the aging treatment. The Ge-containing low-quenching sensitive aluminum alloy provides a reliable aluminum alloy structural material for meeting the needs for large-scale heavy plates and large members in aerospace and other fields.

Description

technical field [0001] The invention discloses a low-quenching-sensitivity aluminum alloy, in particular to a low-quenching-sensitivity aluminum alloy containing Ge; it belongs to the technical field of nonferrous metal alloying. Background technique [0002] High-strength Al-Zn-Mg-Cu alloy has the advantages of low density, high specific strength, hardness, good hot workability, corrosion resistance and fracture toughness. It is widely used in the aerospace field and is an important structural material in this field. one. This series of alloys is an aging-strengthenable alloy, and its high strength and hardness are mainly obtained through solid solution, quenching and aging. The degree of supersaturation of the solid solution obtained after the alloy is quenched has a decisive effect on the aging strengthening effect, so it causes the quenching sensitivity of the alloy [1-3] , that is, the decrease in the quenching rate leads to a decrease in the mechanical properties of ...

AI Technical Summary

Problems solved by technology

The degree of supersaturation of the solid solution obtained after the alloy is quenched has a decisive effect on the aging strengthening effect, so it causes the quenching sensitivity of the alloy [1-3] , that is, the decrease of the quenching rate leads to the decrease of the mechanical properties of the alloy

This problem is particularly prominent for large-scale components, because the core is difficult to obtain sufficient cooling rate under conventional cooling conditions

Especially for some large components, in order to reduce the quenching stress, quenching media such as boiling water and air are often used to reduce the cooling rate

In this way, for large-scale thick plates and large components of conventional aluminum alloys, it is more difficult to obtain good core structure and mechanical properties, resulting in uneven performance of the surface and core of large-scale aluminum alloy thick plates and large components, and overall performance drop [4-5]

Images