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Low-temperature superplastic low-alloy-content magnesium alloy and preparation method thereof

A magnesium alloy and low alloy technology, applied in the field of magnesium alloy, can solve the problems of low strength and ductility, and achieve the effect of promoting dynamic precipitation, simple process and shortening process flow

Active Publication Date: 2021-05-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional magnesium alloys have relatively low strength and ductility due to their inherent hexagonal close-packed (HCP) structure, and are therefore rarely used in critical structural components

Method used

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  • Low-temperature superplastic low-alloy-content magnesium alloy and preparation method thereof
  • Low-temperature superplastic low-alloy-content magnesium alloy and preparation method thereof
  • Low-temperature superplastic low-alloy-content magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A low-temperature superplastic low alloy content Mg-1wt.%Al-1wt.%Zn-0.3wt.%Ca-0.2wt.%Sn (hereinafter referred to as: Mg-1Al-1Zn-0.3Ca-0.2Sn) alloy, it The preparation method comprises the following steps:

[0034] (1) Preparation of sub-rapid solidification cast alloy slab

[0035] Commercially pure Al, commercially pure Zn, commercially pure Sn, Mg-25wt.% Ca master alloy, commercially pure Mg ingots and unavoidable impurities were melted at 680°C, stirred for 1 min under the protection of argon, and then cleaned. Slag treatment, obtain Mg-1Al-1Zn-0.3Ca-0.2Sn alloy melt after holding at 650°C for 10-30min, and then cast the above Mg-1Al-1Zn-0.3Ca-0.2Sn alloy melt into a water-cooled copper mold During cooling and solidification at a speed of 203K / s for 4 minutes, a Mg-1Al-1Zn-0.3Ca-0.2Sn alloy slab was obtained, and the thickness of the slab was 6mm;

[0036] (2) Low temperature controlled rolling with large reduction in single pass

[0037] Preheat the Mg-1Al-1Zn-0....

Embodiment 2

[0042] A high-strength plastic low alloy content Mg-1wt.%Al-1wt.%Zn-0.3wt.%Ca (hereinafter referred to as: Mg-1Al-1Zn-0.3Ca) alloy, its preparation method comprises the following steps:

[0043] (1) Preparation of sub-rapid solidification cast alloy

[0044]Commercially pure Al, commercially pure Zn, commercially pure Sn, Mg-20wt.% Ca master alloy, commercially pure Mg ingots and unavoidable impurities were melted at 670°C and stirred for 2 minutes under the protection of argon. Slag removal treatment, after holding at 650°C for 10-30min to obtain Mg-1Al-1Zn-0.3Ca alloy melt, then cast the alloy melt into a water-cooled copper mold, cool and solidify at a speed of 275K / s for 2min, and obtain Mg - 1Al-1Zn-0.3Ca alloy slab, the thickness of which is 3mm;

[0045] (2) Low temperature controlled rolling with large reduction in single pass

[0046] Preheat the Mg-1Al-1Zn-0.3Ca alloy slab obtained in step (1) at 300° C. for 15 minutes, and perform single-pass rolling to obtain a t...

Embodiment 3

[0049] A low-temperature superplastic low alloy content Mg-1wt.%Al-1wt.%Zn-0.2wt.%Sn-0.1wt.%Ca (hereinafter referred to as: Mg-1Al-1Zn-0.2Sn-0.1Ca) magnesium alloy, Its preparation method comprises the following steps:

[0050] (1) Preparation of sub-rapid solidification cast alloy

[0051] Commercially pure Al, commercially pure Zn, commercially pure Sn, Mg-30wt.% Ca master alloy, commercially pure Mg ingots and unavoidable impurities were melted at 685°C and stirred for 3 minutes under argon protection. Slag removal treatment, after holding at 660°C for 10-30min, the Mg-1Al-1Zn-0.2Sn-0.1Ca alloy melt is obtained, and then the alloy melt is cast into a water-cooled copper mold, and cooled and solidified at a speed of 225K / s for 3min , to obtain Mg-1Al-1Zn-0.2Sn-0.1Ca alloy slab, the thickness of the alloy slab is 5mm;

[0052] (2) Low temperature controlled rolling with large reduction in single pass

[0053] Preheat the Mg-1Al-1Zn-0.2Sn-0.1Ca alloy slab obtained in step (...

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Abstract

The invention provides a low-temperature superplastic low-alloy-content magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components of, in percentage by mass, 1wt.% of Al, 1wt.% of Zn, 0-0.3 wt.% of Ca, 0-0.3 wt.% of Sn, and the balance commercial pure Mg and inevitable impurities. The preparation method of the low-temperature superplastic low-alloy-content magnesium alloy is a short-process preparation method and comprises the following three steps of preparing a sub-rapid solidification as-cast alloy, carrying out single-pass large-rolling-reduction low-temperature controlled rolling and carrying out low-temperature stress relief annealing. Compared with other magnesium alloy preparation methods, according to the preparation method, a as-cast magnesium alloy plate blank with the low alloy content is prepared through the sub-rapid solidification technology, the magnesium alloy with the room-temperature high-strength plasticity and the low-temperature superplasticity is prepared in combination with the single-pass large-rolling-reduction low-temperature controlled rolling method, the tensile strength of the magnesium alloy exceeds 294 MPa, the yield strength exceeds 233 MPa, the elongation at break exceeds 13%, and the elongation at break exceeds 105% at 200 DEG C; and long-time homogenization treatment and multi-pass rolling processes are omitted, the process flow is shortened, and the process cost is saved.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to a low-temperature superplastic magnesium alloy with low alloy content and a preparation method thereof. Background technique [0002] Magnesium and its alloys, as the lightest structural metallic materials, have attracted extensive attention due to their low density and high specific strength. Conventional magnesium alloys have relatively low strength and ductility due to their inherent hexagonal close-packed (HCP) structure, and thus are rarely used in critical structural components. Superplastic magnesium alloys have good ductility under certain conditions, which solves the problem of poor denaturation ability of magnesium alloys to some extent. There are more precipitated phases in magnesium alloys with high alloy content, which can inhibit grain growth during hot deformation to facilitate superplastic deformation, while it is difficult to precipitate a large number of dispers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C23/04C22F1/06B21B1/38B21B37/46B21B37/74C21D1/30C21D9/46C22C1/03
CPCC22C23/02C22C23/04C22C1/03C22F1/06C21D1/30C21D9/46B21B1/38B21B37/74B21B37/46
Inventor 查敏杨一贾海龙王慧远梁家玮任明文马品奎
Owner JILIN UNIV
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