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A method for suppressing the brittle compound of magnesium/aluminum bimetal liquid-solid composite interface

A brittle compound and bimetallic technology, which is applied in the field of non-ferrous metal casting, can solve the problems of high brittleness, low strength, and reduce brittle compounds at the composite interface, and achieve the effects of low cost, optimized interface structure and performance, and suppression of brittle compounds.

Inactive Publication Date: 2016-08-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose a method for suppressing the brittle compound of the Mg / Al bimetallic liquid-solid composite interface, to overcome the shortcomings of the existing Mg / Al bimetallic liquid-solid composite interface, such as low strength and high brittleness, and effectively reduce the composite interface The brittle compound in Mg / Al bimetallic clad material with optimized interfacial structure and performance can be obtained, so that it can meet the requirements of Mg / Al heterogeneous composite structure in production

Method used

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  • A method for suppressing the brittle compound of magnesium/aluminum bimetal liquid-solid composite interface
  • A method for suppressing the brittle compound of magnesium/aluminum bimetal liquid-solid composite interface
  • A method for suppressing the brittle compound of magnesium/aluminum bimetal liquid-solid composite interface

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Embodiment 1

[0023] 300mg of magnesium alloy (AZ31) and 2g of solid aluminum alloy workpiece of 20mmx15mmx4mm (hypoeutectic aluminum-silicon alloy A380, the mass fraction of Si is 7.5%) are connected by liquid-solid composite, and the specific steps are as follows:

[0024] Before the liquid-solid composite, the surface of the solid aluminum alloy workpiece with 7.5% by weight of cheap element Si added to the aluminum alloy is pretreated: first, it is polished with a water mill until the surface finish is grade 6, and then Wash with 60% alcohol by volume, and then wash with distilled water for 10 seconds; then immerse the solid aluminum alloy workpiece in acetone for 5 minutes of ultrasonic cleaning; then immerse the solid aluminum alloy workpiece in a solution containing 20g / L hydrogen Soak in a mixed solution of sodium oxide and 5g / L sodium fluoride for 10s, then take it out and wash it with distilled water for 5s; then put the solid aluminum alloy workpiece into concentrated nitric acid ...

Embodiment 2

[0030] 300mg of magnesium alloy (AZ31) and 2g of 20mmx15mmx4mm solid aluminum alloy workpiece (hypereutectic aluminum-silicon alloy AlSi17, containing 17% Si mass fraction) were connected by liquid-solid composite, and the specific steps were as follows:

[0031] Before the liquid-solid composite, the surface of the solid aluminum alloy workpiece with 17% by weight of cheap element Si added to the aluminum alloy is pretreated: firstly, it is polished with a water mill until the surface finish is grade 6, and then Clean with 59% alcohol by volume, then wash with distilled water for 10 seconds; then soak the solid aluminum alloy workpiece in acetone for 5 minutes for ultrasonic cleaning; then immerse the solid aluminum alloy workpiece Soak in a mixed solution of sodium oxide and 5g / L sodium fluoride for 10s, then take it out and wash it with distilled water for 5s; then put the solid aluminum alloy workpiece into concentrated nitric acid with a concentration of 65% by weight and ...

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Abstract

The invention discloses a method for suppressing the brittle compound of the magnesium / aluminum bimetallic liquid-solid composite interface. treatment, and then die-cast liquid magnesium alloy on the solid aluminum alloy workpiece to form a Mg / Al bimetallic clad material of magnesium-coated aluminum, and place it in a box-type resistance furnace at 410-430°C for 2-3h, then take it out and air-cool it to At room temperature, the Mg / Al double metal clad material with optimized interfacial structure and properties can be obtained. The method of the invention has simple process and is suitable for preparing Mg / Al double metal clad material with complex shape, and can be used for producing automobile engine cylinder heads, crankcases, gear boxes and other parts.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal casting methods, in particular to a method for suppressing brittle compounds at the liquid-solid composite interface of magnesium alloys and silicon-containing aluminum alloys. Background technique [0002] Saving resources and reducing environmental pollution are two major issues that need to be solved urgently in the world's automobile industry. Automobile lightweight is an effective way to achieve energy saving and environmental protection. The lightweight of automobiles has very positive significance for saving energy, reducing emissions, and realizing sustainable development strategies. The development of automobile lightweight technology has promoted the in-depth research and application of cast aluminum alloy and magnesium alloy, and also put forward higher requirements for the quality of aluminum alloy and magnesium alloy products. As the lightest new green engineering structural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/16
Inventor 陈翌庆占小奇徐光晨张辉
Owner HEFEI UNIV OF TECH