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Al-Yb-Zr heatproof aluminium alloy and its heat treatment technology

An al-yb-zr, alloy technology, applied in the field of metal alloys, can solve the problems of slow Zr precipitation process, achieve good thermal stability, improve the effect of aging strengthening, and significantly improve the effect of aging strengthening

Inactive Publication Date: 2013-08-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Al-Yb-Zr heatproof aluminium alloy and its heat treatment technology
  • Al-Yb-Zr heatproof aluminium alloy and its heat treatment technology

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] 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-3Yb 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-Yb and Al-Zr binary alloys, respectively, for comparison.

[0011] Table 1 Experimental alloy composition

[0012] sample

[0013] S2

example 2

[0014] Example 2: The alloy in Example 1 was dissolved at 620±10°C for 20 hours, water quenched to room temperature, and then annealed at intervals of 25°C for 3 hours between 150°C and 575°C. figure 1 The hardness at different temperatures is given, from which it can be seen that the S4 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-Yb alloy. Moreover, the hardness of the alloy added with Zr decreases more slowly than that of the Al-Yb alloy with the increase of temperature, indicating that the thermal stability of the Al-Yb-Zr alloy is better than that of the Al-Yb 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.

example 3

[0015] Example 3: Homogenize alloy S4 in Example 1 at 620±10°C for 20 hours, water quench to room temperature, and then anneal every 25°C for 3 hours from 150°C to 450°C. Afterwards, the rolling deformation is 70% by cold rolling. After rolling, it is annealed at 200-575°C for 1 hour, and the hardness changes as follows: figure 2 As shown, it can be seen that in the temperature range of 200-375 °C, the hardness of the alloy hardly decreases significantly, and the hardness of the alloy decreases significantly at temperatures above 375 °C. figure 2 It shows that the recrystallization temperature of the alloy is about 400℃, and it has good heat resistance.

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Abstract

An Al-Yb-Zr heatproof aluminium alloy and its heat treatment technology belong to the technical field of alloy. 0.07-0.25 wt% of Yb, 0.15-0.3 wt% of Zr and other unavoidable impurities are added into an aluminium matrix. A solid solution and ageing heat treatment process of the alloy comprises the following steps: firstly carrying out solid solution at 620+ / -10 DEG C for 20-30 h, carrying out water quenching to room temperature, and carrying out isochronic ageing every 25 DEG C within 150-575 DEG C for 3 h. By Yb / Zr composite microalloying, the alloy provided by the invention has a very prominent ageing strengthening effect. In comparison with an Al-Er alloy, ageing strengthening effect and heat stability of the alloy are raised; in comparison with an Al-Zr alloy, the ageing precipitation process is obviously accelerated; and the alloy has good heat stability.

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] There is a contradiction between the improvement of aluminum alloy strength and electrical conductivity. To increase the strength must increase the content of alloying elements or increase the amount of processing deformation, and the increase in the content of alloying elements and the increase in processing amount will reduce the electrical conductivity. At the same time, although the addition of Zr in the general heat-resistant alloy wire can improve the heat resistance of the alloy, the aging strengthening effect of the Al-Zr alloy with a low Zr content is poor, and its effect on the strength improvement is not obvious; adding Zr element The content of the alloy can play a certain role in precipitation strengthening, but the electrical conductivity of the alloy decreas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04
Inventor 聂祚仁文胜平高坤元黄晖
Owner BEIJING UNIV OF TECH
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