Manganese aluminum alloy and preparation method therefor

Abstract

Disclosed are a manganese-aluminum alloy and its preparation method. The manganese-aluminum alloy comprises, by weight, 5% to 90% of manganese and the balance of aluminum. The method comprises: adding metal aluminum or molten aluminum to a container, the temperature of the molten aluminum being between 700° C. and 800° C.; adding a metal manganese raw material to the molten aluminum, closing a furnace cover, measuring the pressure, and introducing argon to ensure that the interior of a magnetic induction furnace is in a positive-pressure state, and stirring the mixture with a graphite stirring head; powering on and heating the metal aluminum or the molten aluminum to 1000° C. or above, melting, and holding the temperature between 1000° C. and 1500° C.; and after alloying is completed, cooling to 850° C. or below, opening the furnace cover, and taking a manganese-aluminum alloy out.

1 . A manganese-aluminum alloy, characterized in that, the manganese aluminum alloy being composed of metal aluminum and manganese and comprising, by weight, 55% to 90% of the manganese and the balance of the metal aluminum. 
     
     
         2 . A preparation method of the manganese-aluminum alloy, according to  claim 1 , the method comprising the following steps:
 step S 1 , adding metal aluminum or molten aluminum into a container, wherein a temperature of the molten aluminum is between 700° C. and 800° C.;   step S 2 , adding metal manganese raw material into the molten aluminum, closing a furnace cover, vacuumizing, introducing argon, measuring temperature, and measuring pressure to ensure that an interior of a magnetic induction furnace is in a positive-pressure state, and stirring the mixture with a graphite stirring head;   step S 3 , powering on and heating the metal aluminum or the molten aluminum to 1000° C. or above, melting, and holding the temperature between 1000° C. and 1500° C., wherein the metal aluminum and the manganese form an intermetallic compound in this process and a time required for the alloying process is between 30 min and 2 h; and   step S 4 , after alloying is completed, cooling to 850° C. or below, opening the furnace cover, and taking a manganese-aluminum alloy out.   
     
     
         3 . The preparation method of the manganese-aluminum alloy according to  claim 2 , wherein the container is a crucible placed in a magnetic induction furnace, or a crucible placed in a vacuum resistance furnace, or a non-vacuum container with a protective flux. 
     
     
         4 . The preparation method of the manganese-aluminum alloy according to  claim 3 , wherein a frequency of the magnetic induction furnace ranges from 800 Hz to 1200 Hz. 
     
     
         5 . The preparation method of the manganese-aluminum alloy according to  claim 2 , wherein the metal manganese raw material is manganese powder, or manganese flakes, or a mixture of the manganese powder and the manganese flakes. 
     
     
         6 . The preparation method according to  claim 5 , wherein the manganese powder is a powder of 30 meshes to 300 meshes. 
     
     
         7 . The preparation method according to  claim 2 , wherein in step S 3 , a time of stirring with the graphite stirring head is within a range of 30 min to 2 h. 
     
     
         8 . The preparation method according to  claim 1 , wherein subsequent to step S 4 , further comprising:
 casting the manganese-aluminum alloy into various types of blocks, flakes, or powders with different diameters as required, and adding the manganese-aluminum alloy as a manganese element additive to a smelting preparation process of an aluminum alloy material to increase the strength of the aluminum material produced.