Mg-Sn-Li-Zn magnesium alloy capable of double-stage aging strengthening and preparation method thereof

A mg-sn-li-zn, double-stage aging technology, which is applied in the field of non-ferrous metal materials and metallurgy, can solve the problems of no alloy structure description, etc., and achieve the effect of low alloy cost, good biocompatibility, and easy commercial use

Active Publication Date: 2019-05-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document does not describe the alloy structure of the magnesium alloy before and after aging

Method used

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  • Mg-Sn-Li-Zn magnesium alloy capable of double-stage aging strengthening and preparation method thereof
  • Mg-Sn-Li-Zn magnesium alloy capable of double-stage aging strengthening and preparation method thereof
  • Mg-Sn-Li-Zn magnesium alloy capable of double-stage aging strengthening and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Two-stage aging strengthening after extrusion deformation of Mg-Sn-Li-Zn alloy

[0045] The process route is as follows: casting→homogenizing heat treatment→extrusion→solid solution→quenching→first aging→second aging→finished material.

[0046] The composition of invention example alloy 1~12 is in figure 1 In partition R1 and figure 2 The central partition is in partition S1, as shown in Table 1-1. The invention example alloy was prepared from pure magnesium, Mg-Li master alloy and pure zinc as raw materials. Proportion the raw materials according to the ingredients in Table 1-1, put them into a vacuum induction furnace, vacuumize and fill with inert gas, then start to heat up, refine at 680-750°C for 5-15 minutes, cast, and cool to obtain a slab. Carry out homogenization heat treatment on the slab, and the process system is 300-600 ℃ for 1-48h. Then extruding is carried out, the extrusion temperature is 150-450° C., and the extrusion ratio is 10-40 to o...

Embodiment 2

[0051] Example 2: Mg-Sn-Li-Zn series multi-element magnesium alloy is rolled between two-stage aging

[0052] The process route is as follows: casting→homogenizing heat treatment→first-stage aging→rolling→second-stage aging→finished product.

[0053] The Mg-Sn-Li-Zn base alloy composition of invention example alloy 13~20 is in figure 1 into partition R1 and figure 2 In partition S1, as shown in Table 2-1. The representation of the alloy composition in Table 2-1 conforms to the international practice. Taking the inventive alloy 13 as an example, the contents of Sn, Li, Zn and Ca are 6%, 1%, 6% and 0.1% respectively. Except that Li was added in the form of Mg-Li master alloy, other elements were added in the form of pure substances. The alloy of the invention example is made into a slab according to Example 1 and subjected to homogenization heat treatment. Then carry out the first-stage aging, and keep warm at 60-100°C for 500-1000h. Then rolling is carried out, the proces...

Embodiment 3

[0058] Example 3: Double-stage aging strengthening of Mg-Sn-Li-Zn series multi-element magnesium alloy after rolling

[0059] The process route is as follows: casting→homogenizing heat treatment→rolling→solid solution→quenching→first-stage aging→second-stage aging→finished material.

[0060] The Mg-Sn-Li-Zn basic composition of the invention example alloy 21~30 is in figure 1 into partition R1 and figure 2In partition S1, as shown in Table 3-1. Except that Li was added in the form of Mg-Li master alloy, other elements were added in the form of pure substances. The alloy of the invention example is made into a slab according to Example 1 and subjected to homogenization heat treatment. Then rolling is carried out, the process system is 0-380°C, and the total deformation is 60-98%. Then carry out solid solution, keep warm at 400-600° C. for 10-30 minutes, and then quench in cold water to obtain Mg-based supersaturated solid solution. Then carry out the first stage of aging,...

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Abstract

The invention provides a Mg-Sn-Li-Zn magnesium alloy capable of double-stage aging strengthening and a preparation method thereof. The design of the alloy composition is guided by scientific calculation, the content of Sn and Li is in the specific region of the Mg-Sn-Li phase diagram, and the Zn content is in the specific region of the Mg-Zn phase diagram. According to the Mg-Sn-Li-Zn magnesium alloy capable of double-stage aging strengthening and the preparation method thereof, Li2MgSn is used as the main precipitation phase of the alloy, and the nanometer-scale Li2MgSn nucleation is promotedby the nano Zn rich metastable phase formed in the first-stage aging, so that the aging strengthening effect is improved; and combined with a plastic deformation processing method, grains are refinedand a dislocation substructure is introduced to further improve the mechanical properties of the alloy. At least one of the following elements of Ca, Mn, Na, Sr, Si, and Zr is contained in the alloyas well, so that the combination property of the alloy is good; and the alloy is not only applicable to conventional occasions where a magnesium alloy serves as a structural material, but also used for preparing body implant medical devices.

Description

technical field [0001] The invention relates to a composition design and a preparation method of a Mg-Sn-Li-Zn series magnesium alloy capable of double-stage aging strengthening, and belongs to the field of non-ferrous metal materials and metallurgy. Background technique [0002] Mg-Al-Zn(AZ) series magnesium alloy is the most widely commercial magnesium alloy, however, due to the main second phase Mg in the alloy structure 17 Al 12 Due to the low melting point (458°C), low Mg-Al eutectic temperature (437°C) and Al segregation at the grain boundary lower than the temperature, the creep resistance (or heat resistance) of the AZ series magnesium alloy is relatively low. Low, the long-term service temperature generally does not exceed 120°C. There are two ways to improve the creep resistance of magnesium alloys. One is to optimize the alloy composition based on the AZ system, and the other is to replace the main alloying element Al with other elements, such as replacing Al wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C23/00C22F1/06
Inventor 石章智陈虹廷刘雪峰许俊益
Owner UNIV OF SCI & TECH BEIJING
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