A kind of mg-mn master alloy and preparation method thereof

A master alloy, mg-mn technology, applied in the field of metal materials, can solve the problems of small Mn diffusion coefficient, reduced refinement effect of master alloy, uneven distribution of Mn, etc., to achieve uniform distribution, avoid violent oxidation, and achieve good refinement effect. Effect

Active Publication Date: 2017-12-12
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of spontaneous combustion of magnesium alloys during the smelting process and the small diffusion coefficient of Mn in the magnesium alloy melt, and to avoid the technical deficiency that the uneven distribution of Mn in the melt leads to the reduction of the refinement effect of the prepared master alloy, the present invention provides A Mg-Mn master alloy capable of fine and uniform distribution of α-Mn

Method used

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  • A kind of mg-mn master alloy and preparation method thereof
  • A kind of mg-mn master alloy and preparation method thereof
  • A kind of mg-mn master alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh the raw materials according to the mass percentage of industrial pure magnesium 95% and pure manganese 5%;

[0023] (2) Put Mg and Mn into the crucible at the same time, raise the furnace temperature to 680~700°C, wait until the Mg is completely melted, cover the surface of the melt with a layer of protective solvent with a thickness of 3~8mm, and raise the temperature to 820~950°C , keep warm for 10~20min;

[0024] (3) Direct casting, which can be cast into ingots or prepared into bars.

[0025] In the Mg-Mn master alloy prepared according to the above-mentioned proportion and process, the mass percentage of Mn is 5.3-5.7%.

Embodiment 2

[0027] (1) Weigh the raw materials according to the mass percentage of industrial pure magnesium 90% and pure manganese 10%;

[0028] (2) Put Mg and Mn into the crucible at the same time, use an intermediate frequency furnace to completely melt Mg with a frequency of 170~250HZ, cover the surface of the melt with a layer of protective solvent with a thickness of 4~9mm, and use a frequency of 250~350HZ to raise the temperature To 900~1000℃, keep warm for 20~30min;

[0029] (3) Direct casting, which can be cast into ingots or prepared into bars.

[0030] In the Mg-Mn master alloy prepared according to the above-mentioned proportion and process, the mass percentage of Mn is 10.2-10.9%.

Embodiment 3

[0032] (1) Weigh the raw materials according to the mass percentage of 85% industrial pure magnesium and 15% pure manganese;

[0033] (2) Put Mg and Mn into the crucible at the same time, use an intermediate frequency furnace to completely melt Mg with a frequency of 170~250HZ, cover the surface of the melt with a layer of protective solvent with a thickness of 5~9mm, and use a frequency of 300~350HZ to raise the temperature To 900~1000℃, keep warm for 30~40min;

[0034] (3) Direct casting, which can be cast into ingots or prepared into bars.

[0035] In the Mg-Mn master alloy prepared according to the above-mentioned proportion and process, the mass percentage of Mn is 15.4-16.1%.

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Abstract

The invention belongs to the field of metal materials, and relates to a Mg-Mn master alloy for uniform and fine-grained magnesium alloy structure and a preparation method thereof. In the master alloy system, most of Mn exists in the form of α‑Mn dendrites. The alloy is: 85-95% Mg, 5-15% Mn by weight percentage. The preparation steps are: prepare industrially pure Al and industrially pure Mn in proportion, put them into a graphite crucible at the same time, raise the furnace temperature to 680~700°C, wait until the Mg is completely melted, and cover the surface of the melt with a layer thickness greater than 2.5 mm of NaCl powder or KCl powder, heat up to 820~1000°C, and keep warm for 5~40min; or use an intermediate frequency furnace to completely melt Mg at a frequency of 170~250Hz, and cover the surface of the melt with a layer of NaCl powder or NaCl powder with a thickness greater than 2.5mm. For KCl powder, the temperature is raised to 820-1000°C at a frequency of 200-350 Hz, and the temperature is kept for 5-40 minutes; finally, the melt is directly poured into an ingot or prepared into a wire. The prepared Mg‑Mn master alloy has a good uniform refinement effect on the Mg alloy structure and can significantly improve the mechanical properties of the alloy.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a Mg-Mn master alloy for uniform and fine-grained magnesium alloy structure and a preparation method thereof. Background technique [0002] In industrial production, Mn elements are generally introduced into alloys in the form of Mn master alloys, mainly including Al-Mn and Mg-Mn master alloys. Among them, the use of Mg-Mn master alloys to introduce Mn elements into magnesium alloys does not introduce other elements, and the existence and distribution of Mn elements in master alloys will significantly affect the distribution of Mn in the melt, thereby affecting the solidification of magnesium alloys. organize. [0003] At present, the widely used Mn-containing master alloys are mainly Al-Mn and Mg-Mn master alloys. For aluminum alloys and magnesium alloys, Mn has a high melting point, is difficult to melt after adding, and has a high density, which is prone to melt ov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03B22D27/20
Inventor 滕新营张金洋贾鹏许敏刘忠鹏
Owner UNIV OF JINAN
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