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A dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance and preparation method

A magnesium-lithium alloy, high-strength and high-modulus technology, applied in the field of metal material magnesium alloy, can solve the problems of complex preparation method, unsatisfactory use, failure to ensure light weight and low cost of magnesium-lithium alloy

Active Publication Date: 2022-07-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] CN107523770 B discloses a heat treatment process for improving the properties of a long-range structural ordered phase-strengthened dual-phase magnesium-lithium alloy. The preparation method is to effectively improve the strength, plasticity and corrosion resistance of the dual-phase magnesium-lithium alloy by adopting Zn element and solid solution heat treatment process However, the tensile strength of the long-range ordered phase-strengthened dual-phase magnesium-lithium alloy is 120-180MPa, which is lower than 200MPa; the yield strength is 100-150MPa, which is lower than 200MPa, and the elongation is far less than 16%; therefore, although it adopts solution heat treatment The strength of the alloy has been improved, but the strength has not yet reached the desired goal of practical application, and cannot meet the engineering application technical requirements of magnesium-lithium alloys
[0007] CN113430436A discloses a low-density, high-elastic-modulus as-cast dual-phase magnesium-lithium alloy and its preparation method. The preparation method is to make the dual-phase magnesium-lithium alloy self-generate quasi-crystalline phase in situ by precisely regulating the Zn / Y ratio, thereby improving the material elastic modulus, but the elastic modulus of the alloy material obtained by this method is still lower than 50GPa, which cannot meet the requirements of military, aviation and medical fields.
At the same time, the addition of Zn content exceeding 5% cannot achieve the synergistic improvement of low density, high strength and high modulus of magnesium-lithium alloys, and it is expected to be improved to meet practical engineering applications
[0008] CN110029254 B discloses a multi-element micro-alloyed dual-phase magnesium-lithium alloy and its preparation method. Although the patent obtains a high-strength and high-ductility dual-phase magnesium-lithium alloy through multi-element micro-alloy, casting, plastic forming and heat treatment processes, the preparation method Complicated, not only need to melt the ingot but also homogenize it and then roll it into shape, which prolongs the preparation cycle, time-consuming and high cost
[0009] To sum up, in order to meet the technical requirements of improving the corrosion resistance, high strength or high elongation of dual-phase magnesium-lithium alloys in the research of magnesium-lithium alloys, methods such as alloying, plastic deformation, and heat treatment have been adopted, but the magnesium-lithium alloys have not been guaranteed. Under the premise of light weight and low cost of lithium alloy, synergistically improve the comprehensive properties of dual-phase magnesium-lithium alloy such as strength, modulus and corrosion resistance

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  • A dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance and preparation method
  • A dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance and preparation method
  • A dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance and preparation method

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Embodiment 1

[0056] A dual-phase magnesium-lithium alloy with aging softening resistance, high strength and high modulus corrosion resistance is composed of the following elements by mass percentage: Gd: 0.8wt.%, Al: 3wt.%, Y: 3wt.%, Li: 9wt.%, Zn: 3wt.%, Mn: 1wt.%, Ag: 1wt.%, the balance is Mg and inevitable impurities, and the total amount of Si, Fe, Cu, Ni, Ca impurities in the impurities is less than 0.03 wt.%.

[0057] The preparation method of the dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance comprises the following steps:

[0058] S1, raw material preparation stage

[0059] According to the dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance, the element composition of the following mass percentages is as follows. Y Mg-20wt.%Y master alloy, 1wt.%Mn Mg-20wt.%Mn master alloy, 3wt.% pure Al, 9wt.% pure Li, 3wt.% pure Zn, 1wt.% pure Ag , the remainder is pu...

Embodiment 2

[0068] A dual-phase magnesium-lithium alloy with aging softening resistance, high strength and high modulus corrosion resistance is composed of the following elements by mass percentage: Gd: 2wt.%, Al: 3wt.%, Y: 2wt.%, Li: 5wt.%, Zn : 1wt.%, Mn: 0.5wt.%, Ag: 1wt.%, the balance is Mg and inevitable impurities, and the total amount of Si, Fe, Cu, Ni, Ca impurities in the impurities is less than 0.03 wt.%.

[0069] The preparation method of the dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance comprises the following steps:

[0070] S1, raw material preparation stage

[0071] According to the dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance, the element composition of the following mass percentages is as follows: the total weight is Mg-30wt.%Gd master alloy containing 2wt. Mg-30wt.%Y master alloy, Mg-20wt.%Mn master alloy with 0.5wt.%Mn, Mg-20wt.%Li ma...

Embodiment 3

[0080] A dual-phase magnesium-lithium alloy with aging softening resistance, high strength and high modulus corrosion resistance is composed of the following elements by mass percentage: Gd: 2.5wt.%, Al: 2wt.%, Y: 2wt.%, Li: 7wt.%, Zn: 4wt.%, Mn: 0.5wt.%, Ag: 2wt.%, the balance is Mg and inevitable impurities, the total amount of Si, Fe, Cu, Ni, Ca impurities in the impurities is less than 0.03 wt.% .

[0081] The preparation method of the dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance comprises the following steps:

[0082] S1, raw material preparation stage

[0083] According to the dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance, the element composition of the following mass percentages is as follows: Mg-30wt.%Y master alloy for Y, Mg-20wt.%Mn master alloy with 0.5wt.%Mn, Mg-20wt.%Li master alloy with 7wt.%Li, 2wt.% pure Al, 4wt .% pure Zn,...

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Abstract

The invention discloses a dual-phase magnesium-lithium alloy with aging softening resistance, high strength, high modulus and corrosion resistance and a preparation method, belonging to the technical field of metal material magnesium alloys. : 0.5‑5 wt.%, Y: 0.05‑5wt.%, Li: 5‑10wt.%, Zn: 0.05‑4.5wt.%, Mn: 0.05‑3wt.%, Ag: 0.01‑4.5wt.%, The balance is Mg and inevitable impurities. The preparation method includes a raw material preparation stage, a vacuum centrifugal casting and a heat treatment stage. The invention can control the low density of the dual-phase magnesium-lithium alloy and synergistically improve the strength, elongation and Elastic Modulus.

Description

technical field [0001] The invention belongs to the technical field of metal material magnesium alloys, and relates to a dual-phase magnesium-lithium alloy with anti-aging softening, high strength and high modulus corrosion resistance and a preparation method. Background technique [0002] Magnesium alloys have the characteristics of light weight, high specific strength and good biocompatibility, and have broad application prospects in biomedical materials, automobiles, aerospace and 3C (computer, communication, consumer electronics) industries. However, due to the inherent lattice structure characteristics of magnesium alloys, low symmetry, less room temperature slip system than other metals (such as: aluminum), and unstable plastic deformation ability, its development is seriously restricted. [0003] Magnesium-lithium alloys are by far the least dense metal structural materials, also known as ultra-light alloys. Due to the low density of the lithium element, the density ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/02C22F1/06B22D13/00
CPCC22C23/00C22C1/03C22F1/02C22F1/06C22F1/002B22D13/00
Inventor 王俊升田光元杨兴海薛程鹏苏辉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY