CN101403062A

CN101403062A - Rare earth Er microalloyed Al-Mg-Mn-Zr alloy

Info

Publication number: CN101403062A
Application number: CNA2008102267308A
Authority: CN
Inventors: 聂祚仁; 林双平; 黄晖; 王旭东
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2008-11-21
Filing date: 2008-11-21
Publication date: 2009-04-08

Abstract

An Al-Mg-Mn-Zr alloy micro-alloyed by rare earth Er belongs to the technical field of metal alloys. The alloy constituents and the weight percent thereof of the alloy provided by the invention are as follows: 4.6-8 percent of Mg, 0.7 percent of Mn, 0.05-1.0 percent of Er, 0.1 percent of Zr, and the rest of Al, wherein the weight percents of the rare earth Er and the Mg of the alloy are preferably 0.1-0.5 percent and 4.6-6.5 percent. Owing to the addition of the rare earth Er, the mechanical performance of an Al-Mg-Mn-Zr alloy cold-rolled sheet is enhanced, the normal temperature and high temperature (150 DEG C) tensile strength (sigma b) and yield strength (sigma 0.2) of the alloy are improved, and the extensibility (delta) is basically constant. Therefore, the Er is expected to be an effective alloy element to improve the comprehensive performance of the aluminum alloy.

Description

Al-Mg-Mn-Zr alloy micro-alloyed by rare earth Er

Technical field

The present invention relates to field of metal alloy technology, belong to a kind of aluminum alloy materials specifically through microalloying.

Background technology

The explored rare earth reserves of China account for 80% of world's rare earth total reserves (4,500 ten thousand tons), rank first in the world, and so abundant rare earth resources has promoted the research and development work of China's rare earth aluminium alloy greatly.The research starting of China's rare earth aluminium alloy early, the aspects such as applied research of rare earth in electrician's aluminium alloy and architectural aluminum section obtained good result, to various rare earth elements in the Al-Si alloy metamorphism and the cleaning action of rare earth also further investigate.But for a long time, the rare earth aluminium alloy R﹠D work of China mostly concentrates on the applied research aspect, serve as at most with La, Ce, Y and mishmetal to the influence of aluminium alloy and mechanism research again wherein, to existence form and the research mechanism of action aspect the then shorter mention of other single rare earth element in aluminium and alloy thereof.

We have found Cheap rare-earth element Er a series of active effect in aluminium alloy by beforehand research work in early stage; And Al-Mg be alloy as the exemplary alloy series in the aluminium alloy family, have a lot of excellent properties, it is studied can develop a series of novel high-performance aluminium alloys.

Summary of the invention

The object of the present invention is to provide a kind of Al-Mg-Mn-Zr alloy micro-alloyed by rare earth Er, in the Al-Mg-Mn-Zr alloy, added micro-Er, improve structure property stability, suppress or slow down the β phase along brilliant precipitation and promote intracrystalline to decompose, alloy matrix aluminum is played strengthening effect, thereby improve the performance of aluminium alloy.

Al-Mg-Mn-Zr alloy micro-alloyed by rare earth Er provided by the invention, wherein each alloy component and weight percent thereof are: Mg:4.6～8%, Mn:0.7%, Er:0.05～1.0%, Zr:0.1%, surplus is Al.The weight percent of preferred rare earth Er is 0.1～0.5% in the alloy, and the weight percent of Mg is 4.6～6.5%.

Al-Mg-Mn-Zr alloy micro-alloyed by rare earth Er of the present invention

The Al-Mg alloy of the high Mg content of process Er microalloying adopts the preparation of semicontinuous casting method.Select for use fine aluminium (99.99%), pure magnesium (99.95%) and Al-10Mn master alloy, Al-3%Zr master alloy, and the Al-6Er master alloy be raw material, with raw material in 780～800 ℃ of meltings, wait alloy to melt fully after, utilize C ₂Cl ₆Carry out degasification, be cast into alloy cast ingot in 710～730 ℃ again.Alloy cast ingot through the processing of 470 ℃/20h homogenizing, crop, mill face after, in 460 ℃ of hot rollings, hot rolling total deformation about 70～85%.The laggard interline annealing of hot rolling, annealing temperature is 400 ℃, insulation 1h.Annealing back air cooling to room temperature is carried out cold rolling again, and the sheet alloy thickness that finally obtains is 1.5mm, and cold rolling total deformation is about 50～65%.

Beneficial effect of the present invention:

Because the present invention has added rare earth Er in the Al-Mg-0.7Mn-0.1Zr of different Mg content alloy, improved the mechanical property of Al-Mg-Mn-Zr alloy cold-reduced sheet, makes the normal temperature and high temperature (150 ℃) tensile strength (σ of alloy _b) and yield strength (σ _0.2) all improve, its unit elongation (δ) remains unchanged substantially.The improvement that contains the Al-Mg-Mn-Zr alloy property of Er mainly is because Er and matrix have formed the Al of coherence or half coherence ₃The Er fine particle.

Description of drawings:

Fig. 1: the normal temperature of Al-Mg-0.7Mn-0.1Zr-Er cold-reduced sheet (25 ℃) tensile mechanical properties curve;

Fig. 2: the high temperature of Al-Mg-0.7Mn-0.1Zr-Er cold-reduced sheet (150 ℃) tensile mechanical properties curve.

Fig. 3: the projection electromicroscopic photograph of Al-Mg-0.7Mn-0.1Zr-Er cold-reduced sheet.

Fig. 4: Al ₃The compound diffraction spot of Er and matrix.

Embodiment:

The present invention is further elaborated below in conjunction with embodiment and accompanying drawing.

Al scaling loss amount is according to 3% in following examples, and the Mg scaling loss is according to 10%, and master alloy is disregarded scaling loss.

Embodiment 1

With 99.99% rafifinal, 99.95% pure magnesium and Al-10%Mn master alloy, Al-3%Zr master alloy, Al-6%Er master alloy is raw material, in 780～800 ℃ of meltings, wait alloy to melt fully after, utilize C ₂Cl ₆Carry out degasification, again in 710～730 ℃ of casting, obtaining composition is the Al-4.6Mg-0.7Mn-0.1Zr-0.05Er alloy cast ingot.Alloy cast ingot through the processing of 470 ℃/20h homogenizing, crop, mill face after, in 460 ℃ of hot rollings, the annealing of the laggard interline of hot rolling, annealing temperature is 400 ℃, insulation 1h.Annealing back air cooling to room temperature is carried out cold rolling again, and the sheet alloy thickness that finally obtains is 1.5mm.Measure its mechanical property under room temperature (25 ℃), the result is shown in A alloy in the table 1.Measure it again at high temperature (150 ℃) tensile strength and unit elongation, the result is shown in table 2 interalloy A.

Embodiment 2

With 99.99% rafifinal, 99.95% pure magnesium and Al-10%Mn master alloy, Al-3%Zr master alloy, Al-6%Er master alloy, in 780～800 ℃ of meltings, wait alloy to melt fully after, utilize C ₂Cl ₆Carry out degasification, again in 710～730 ℃ of casting, obtaining composition is the Al-6Mg-0.7Mn-0.1Zr-0.3Er alloy cast ingot.Alloy cast ingot through the processing of 470 ℃/20h homogenizing, crop, mill face after, in 460 ℃ of hot rollings, the annealing of the laggard interline of hot rolling, annealing temperature is 400 ℃, insulation 1h.Annealing back air cooling to room temperature is carried out cold rolling again, and the sheet alloy thickness that finally obtains is 1.5mm.Measure its mechanical property under room temperature (25 ℃), the result is shown in B alloy in the table 1.Measure it again at high temperature (150 ℃) tensile strength and unit elongation, the result is shown in table 2 interalloy B.

Embodiment 3

With 99.99% rafifinal, 99.95% pure magnesium and Al-10%Mn master alloy, Al-3%Zr master alloy, Al-6%Er master alloy, in 780～800 ℃ of meltings, wait alloy to melt fully after, utilize C ₂Cl ₆Carry out degasification, again in 710～730 ℃ of casting, obtaining composition is the Al-8Mg-0.7Mn-0.1Zr-1Er alloy cast ingot.Alloy cast ingot through the processing of 470 ℃/20h homogenizing, crop, mill face after, in 460 ℃ of hot rollings, the annealing of the laggard interline of hot rolling, annealing temperature is 400 ℃, insulation 1h.Annealing back air cooling to room temperature is carried out cold rolling again, and the sheet alloy thickness that finally obtains is 1.5mm.Measure its mechanical property under room temperature (25 ℃), the result is shown in C alloy in the table 1.Measure it again at high temperature (150 ℃) tensile strength and unit elongation, the result is shown in table 2 interalloy C.

Table 1Al-XMg-0.7Mn-0.1Zr-XEr alloy at room temperature (25 ℃) mechanical property

Table 2Al-XMg-0.7Mn-0.1Zr-XEr alloy at room temperature (150 ℃) mechanical property

From table 1 and table 2 as can be seen, in the different Al-Mg-Mn-Zr alloy alloy of Mg content, add Er, can improve tensile strength, the yield strength of cold rolling attitude alloy room temperature, and keep higher unit elongation; This alloy cold-reduced sheet is except that the high strength property of maintenance during high temperature (150 ℃), and the plasticity of alloy obviously improves, and unit elongation reaches 38%.Strengthening effect is best when adding 0.3% the Er account for final product in the Al-Mg-0.7Mn-0.1Zr alloy of Mg content between 4.6～6.5%, and the amplitude that improves in the alloy of different Mg content is slightly different.The cited sheet alloy of the present invention is the 1.5mm cold-reduced sheet, and is suitable equally for the sheet material of other thickness.

Fig. 1 has listed normal temperature, the high temperature tensile properties of different process under four kinds of cold rolling attitudes of Er content alloy in 2.Therefrom as can be seen, Er can improve normal temperature and high temperature (150 ℃) tensile strength and the yield strength of the thick cold rolled sheet of 1.5mm to some extent, and along with the increase of Er addition, the intensity increase rate also increases, but increase trend is slowed down, and Er is little to the plasticity influence of Al-Mg-Mn-Zr alloy.

Adopt the second phase particle morphology (as Fig. 3) of transmission electron microscope observing Al-4.6Mg-0.7Mn-0.1Zr-0.4Er alloy, and the relation of the coherence between particle and the matrix has been made the composite electron diffracting spectrum analyzed (as Fig. 4), the result shows the Al that separates out in the matrix ₃The Er particle is tiny bean cotyledon shape, and (size has only 10～20nm), and certain coherence relation is arranged between the Al matrix, can play good pinning dislocation, hinders the effect of slippage, like this Al ₃The Er particle just might become the efficient hardening phase in the aluminium alloy.

Claims

1, a kind of Al-Mg-Mn-Zr alloy micro-alloyed by rare earth Er is characterized in that: wherein each alloy component and weight percent thereof are: Mg:4.6～8%, and Mn:0.7%, Er:0.05～1.0%, Zr:0.1%, surplus is Al.

2, Al-Mg-Mn-Zr alloy micro-alloyed by rare earth Er according to claim 1 is characterized in that: wherein the weight percent of Er is 0.1～0.5%, and the weight percent of Mg is 4.6～6.5%.