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Al-Er-Zr alloy and ageing strengthening process thereof

An al-er-zr, alloy technology, applied in the field of metal alloys, can solve the problems of slow precipitation of Zr, advance of the precipitation process, etc., to achieve accelerated aging precipitation, significant aging strengthening effect, and improving aging strengthening effect and thermal stability. sexual effect

Inactive Publication Date: 2011-04-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition to Sc, Zr is a metastable L1 2 The alloying element of the structure precipitation phase, but the precipitation process of Zr itself is very slow, especially in the case of low composition, it takes thousands of hours to fully analyze
After composite microalloying with Er, it is possible to advance the precipitation process under the induction of Al3Er phase

Method used

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  • Al-Er-Zr alloy and ageing strengthening process thereof
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  • Al-Er-Zr alloy and ageing strengthening process thereof

Examples

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Effect test

example 1

[0012] Example 1: An alloy ingot was prepared by melting in a graphite crucible and casting in an iron mold. The raw materials used were pure aluminum and Al-6Er and Al-4Zr master alloys, and the melting temperature was 780±10°C. After reaching the melting temperature, keep it warm for 30 minutes, and then cast it with an iron mold. Five alloys with different compositions were prepared, and their actual compositions were tested by XRF, as shown in Table 1 below. The S1 and S2 samples are Al-Er and Al-Zr binary alloys, respectively, for comparison.

[0013] Table 1 Experimental alloy composition

[0014] sample

example 2

[0015] Example 2: The alloy in Example 1 was solid-dissolved at 640±10°C for 30 hours, water quenched to room temperature, and then annealed at intervals of 25°C for 3 hours between 200°C and 575°C. figure 1 The hardness at different temperatures is given, from which it can be seen that the S5 alloy reaches a maximum hardness value of about 50HV at 400°C, which is much higher than the maximum hardness value of the S1 Al-Er alloy. Moreover, the hardness of the alloy added with Zr decreases more slowly than that of the Al-Er alloy with the increase of temperature, indicating that the thermal stability of the Al-Er-Zr alloy is better than that of the Al-Er alloy. In addition, Al-Zr alloy did not appear strengthening phenomenon, which is because the precipitation process of Al-Zr alloy is too slow, 3 hours annealing is not enough to make it precipitate. From figure 1 It can also be seen that the S5 sample has the highest hardness, so the optimum composition range of the alloy s...

example 3

[0016] Example 3: The alloy in Example 1 was solid-dissolved at 640±10°C for 20 hours, water quenched to room temperature, and then aged at 350°C isothermally. figure 2 The hardness change curve of isothermal aging is given. It can be seen from the figure that the maximum hardness value of the S5 sample is the highest, reaching 56HV, which is much higher than that of the S1 Al-Er binary alloy sample. Compared with the Al-Er binary alloy, the hardness of the alloy added with Zr decreases slowly with time, indicating that its thermal stability is improved. The Al-Zr binary alloy aged at this temperature for 500 hours still did not show strengthening phenomenon, but the alloy added with Er showed obvious age hardening, which indicated that the presence of Er promoted the precipitation of Zr.

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Abstract

The invention discloses an Al-Er-Zr alloy and an ageing strengthening process thereof, and belongs to the technical field of alloys. The alloy is prepared by adding 0.09 to 0.3 weight percent of Er and 0.08 to 0.3 percent of Zr into an aluminum substrate. The solid solution ageing heat treatment process of the alloy comprises the following steps of: performing solid solution at the temperature of 640+ / -10 DEG C for 20 to 30 hours, performing water quenching to room temperature, and ageing at the temperature of between 200 and 575 DGE C for 3 hours at intervals of 25 DEG C, or ageing at the constant temperature of between 300 and 450 DEG C, wherein the optimal constant ageing temperature is between 350 and 400 DEG C. Through the composite micro-alloying of Er and Zr, the Al-Er-Zr alloy has obvious ageing strengthening effect; and the ageing strengthening effect and thermal stability of the Al-Er-Zr alloy are higher than those of an Al-Er alloy, and the ageing precipitation speed is obviously higher than that of the Al-Zr alloy.

Description

technical field [0001] The invention relates to a micro-alloyed aluminum alloy material and a heat treatment process thereof, belonging to the technical field of metal alloys. technical background [0002] In recent years, a large number of scholars at home and abroad have done a lot of research on the role of rare earth elements in aluminum alloys. These studies mainly focus on the effects of La, Ce, Y, Sc, Zr and mixed rare earths on aluminum alloys, among which the rare earth element Sc is the most in-depth research, in the Al-Si system, Al-Zn-Mg system and Al-Mg system Satisfactory research results have been obtained by adding Sc to aluminum alloys. However, the addition of Sc greatly increases the production cost of aluminum alloys, which limits the industrial application of Sc-containing aluminum alloys. Adding Er to aluminum alloy can generate and Al 3 Sc acts the same as Ll 2 structure of Al 3 The Er phase can increase the recrystallization temperature of the al...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22F1/04
Inventor 文胜平高坤元黄晖聂祚仁
Owner BEIJING UNIV OF TECH
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