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Aluminum-chromium-boron intermediate alloy and preparation method thereof

A master alloy, al-b technology, applied in the field of modifiers, can solve the problems of increased difficulty in controlling the composition of aluminum alloys, high cost of master alloy preparation, and increased cost of deterioration, so as to reduce the growth time, reduce the total amount of master alloy, Effect of Controlling Alloy Composition

Inactive Publication Date: 2018-06-05
GUANGDONG INST OF MATERIALS & PROCESSING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature [Song Dongfu, Wang Shuncheng, Zhou Nan, Nong Deng, Zheng Kaihong. Research progress on the morphology of iron-rich phase in Al-Si alloy and its influencing factors[J]. Materials Engineering, 2016,44(05):120-128.] reported The effect of chromium element replacing iron element in iron-rich phase is better than that of manganese element, but the addition of low content of chromium will cause the precipitation of primary silicon, which will affect its application
Due to the high cost of preparation of the master alloy and the large total amount required for step-by-step addition, the cost of deterioration is further increased
At the same time, there may be differences in the content of impurity elements in the two types of master alloys, which makes it more difficult to control the composition of aluminum alloys with lower requirements for impurity elements, which further limits the application of step-by-step compound addition of two types of alloy elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) The raw materials are weighed according to the mass fraction of 70% Al-Cr master alloy, 15% Al-B master alloy and 15% industrial pure aluminum, wherein the mass percentage content of Cr in the Al-Cr master alloy is 20%, Al- The mass percent content of B in the B master alloy is 10%, and the purity of industrial pure aluminum is 99.5%;

[0016] (2) Put the Al-Cr master alloy and industrial pure aluminum in an intermediate frequency furnace, heat them to 500°C, keep them warm for 60 minutes, and then raise the temperature to 900°C;

[0017] (3) After the Al-Cr master alloy is completely melted, the temperature is lowered to 850°C, and then the Al-B master alloy is added;

[0018] (4) After the Al-B master alloy is completely melted, it is refined, kept at heat for 30 minutes, and then poured into an ingot to obtain an aluminum-chromium-boron master alloy;

[0019] (5) Test the chemical composition of aluminum-chromium-boron master alloy.

Embodiment 2

[0021] (1) Weigh the raw materials according to the mass fraction of 80% Al-Cr master alloy, 15% Al-B master alloy and 5% industrial pure aluminum, wherein the mass percentage content of Cr in the Al-Cr master alloy is 10%, Al- The mass percent content of B in the B master alloy is 8%, and the purity of industrial pure aluminum is 99.5%;

[0022] (2) Heat the Al-Cr master alloy and industrial pure aluminum in an intermediate frequency furnace to 500°C and keep it warm for 60 minutes, then raise the temperature to 880°C;

[0023] (3) After the Al-Cr master alloy is completely melted, the temperature is lowered to 840°C, and then the Al-B master alloy is added;

[0024] (4) After the Al-B master alloy is completely melted, it is refined, kept at heat for 30 minutes, and then poured into an ingot to obtain an aluminum-chromium-boron master alloy;

[0025] (5) Test the chemical composition of aluminum-chromium-boron master alloy.

Embodiment 3

[0027] (1) The raw materials are weighed according to the mass fraction of 50% Al-Cr master alloy, 12% Al-B master alloy and 38% industrial pure aluminum, wherein the mass percentage content of Cr in the Al-Cr master alloy is 10%, and the Al- The mass percent content of B in the B master alloy is 5%, and the purity of industrial pure aluminum is 99.5%;

[0028] (2) Heat the Al-Cr master alloy and industrial pure aluminum in an intermediate frequency furnace to 500°C and keep it warm for 60 minutes, then raise the temperature to 880°C;

[0029] (3) After the Al-Cr master alloy is completely melted, the temperature is lowered to 820°C, and then the Al-B master alloy is added;

[0030] (4) After the Al-B master alloy is completely melted, it is refined, kept at heat for 30 minutes, and then poured into an ingot to obtain an aluminum-chromium-boron master alloy;

[0031] (5) Test the chemical composition of aluminum-chromium-boron master alloy.

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Abstract

The invention provides an aluminum-chromium-boron intermediate alloy and a preparation method thereof. The intermediate alloy is prepared from the following components in percentage by mass: 78.6 to 98.6 percent of Al, 1.0 to 18.0 percent of Cr, 0.1 to 3.0 percent of B, less than or equal to 0.15 percent of Fe, less than or equal to 0.10 percent of Si and less than or equal to 0.15 percent of other impurity elements. The aluminum-chromium-boron ternary intermediate alloy provided by the invention is used as an iron-enriching phase modifier, so that the existence of an iron-enriching phase anda primary iron phase can be completely eliminated and a uniform Chinese-character-shaped iron-enriching phase is obtained; the total amount of the intermediate alloy needed by a process of compoundingby steps and adding a chromium element and a boron element also can be greatly reduced; meanwhile, process links are reduced, alloy components are easy to control and the intermediate alloy is more suitable for industrial production; the precipitation of primary crystal silicone is caused by chromium with relatively low content, so that the aluminum-chromium-boron intermediate alloy is more suitable for iron-enriching phase modification of an aluminum alloy which does not contain silicon or has relatively low silicon content.

Description

technical field [0001] The invention relates to an iron-rich phase modifier in aluminum and aluminum alloy materials, in particular to an aluminum-chromium-boron intermediate alloy and a preparation method thereof. Background technique [0002] Iron is the most common impurity element in aluminum alloys. Since the maximum solubility of iron in aluminum solids at room temperature is 0.05wt.%, it is only 1 / 100 to 1 / 34 of the maximum solubility in aluminum melts. Therefore, iron basically exists in the form of a brittle and hard iron-rich phase in aluminum alloys. According to the crystal structure of the iron-rich phase, it can be divided into α-Fe phase and β-Fe phase, in which the β-Fe phase is a monoclinic structure with a long and narrow needle shape, which splits the aluminum matrix when it is stressed, and becomes the source of cracks. Extending along the length direction of the iron-rich phase greatly damages the plasticity of the aluminum alloy. The α-Fe phase has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/00
CPCC22C1/026C22C1/03C22C21/00
Inventor 宋东福甘春雷刘庆德郑开宏周楠周东明
Owner GUANGDONG INST OF MATERIALS & PROCESSING