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Preparation method of reinforced 6061aluminum matrix composite material

A technology of aluminum matrix composite material and aluminum alloy, which is applied in the field of 6061 aluminum matrix composite material preparation, can solve problems such as entanglement and agglomeration, reduction of length-to-diameter ratio, and magnesium borate whiskers cannot be completely uniformly dispersed, so as to achieve cost saving, Reduce the effect of the preparation process

Inactive Publication Date: 2013-09-04
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the current research on magnesium borate whisker-reinforced aluminum matrix composites is still in the stage of theoretical research, and there is no report on magnesium borate whisker-reinforced aluminum matrix composites prepared by powder hot extrusion method.
Whiskers were broken during the preparation process, the length-to-diameter ratio was severely reduced, and magnesium borate whiskers could not be completely and uniformly dispersed in the matrix phase during ball milling and hot extrusion, so entanglement and agglomeration inevitably occurred

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  • Preparation method of reinforced 6061aluminum matrix composite material

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[0017] The present invention is a method for preparing a reinforced 6061 aluminum-based composite material, the steps of which are:

[0018] (1) According to the volume fraction of the total volume of the mixture of magnesium borate whiskers and 6061 aluminum alloy powder is 5%~20%, mix magnesium borate whiskers with 6061 aluminum alloy powder, put them into a ball mill for ball milling, and set the ball milling parameters as : The ball-to-material ratio is 10:1, the speed of the ball mill is 150r / min, the ball milling time is 10h, the working mode of the ball mill is forward rotation for 600s, stop for 60s, then reverse for 600s, stop for 60s, and so on;

[0019] (2) Put the ball-milled powder in the mold cavity and press it into a pre-compact at 100°C;

[0020] (3) Then heat slowly to 510°C for 30 minutes, and finally extrude uniformly at a speed of 10mm / s with an extrusion ratio of 9:1 to obtain a smooth-surfaced composite extruded rod. The outer wall is coated with a cert...

Embodiment 1

[0023] Put the magnesium borate whisker volume fraction of 15% and 85vol.% 6061 aluminum alloy powder mixture into a planetary ball mill for ball milling, with 65g in each can, and four cans in total. Set the ball mill parameters as follows: ball-to-material ratio 10:1, ball mill speed 150r / min, ball mill time 10h, ball mill working mode is forward rotation 600s, stop 60s, then reverse 600s, stop 60s, and so on. The ball-milled sample powder was placed in the mold cavity and pressed at 100°C to form a Φ60 mm pre-compact. Then slowly heat to 510°C and keep it warm for 30 minutes, and finally extrude uniformly at a speed of 10mm / s with an extrusion ratio of 9:1 to obtain a Φ20mm smooth composite extruded rod. Before extrusion, the inner and outer walls of the mold are uniform Apply a certain amount of lubricant. The measured room temperature mechanical properties of 15vol.% magnesium borate whisker reinforced 6061 aluminum matrix composites are: Vickers hardness HV=65.3, yield ...

Embodiment 2

[0025] Put the magnesium borate whisker volume fraction of 10% and 90vol.% 6061 aluminum alloy powder mixture into a planetary ball mill for ball milling, with 65g in each can, and four cans in total. Set the ball milling parameters as follows: the balls are Al2O3 balls, the ball-to-material ratio is 10:1, the speed of the ball mill is 150r / min, the milling time is 10h, the working mode of the ball mill is forward rotation for 600s, stop for 60s, then reverse for 600s, stop for 60s, and so on. . The ball-milled sample powder was placed in the mold cavity and pressed at 100°C to form a Φ60 mm pre-compact. Then slowly heat to 540°C for 30 minutes, and finally extrude uniformly at a speed of 10mm / s with an extrusion ratio of 25:1 to obtain a Φ12mm smooth composite extruded rod. Before extrusion, the inner and outer walls of the mold are uniform Apply a certain amount of lubricant. The measured room temperature mechanical properties of magnesium borate whisker reinforced 6061 al...

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Abstract

A preparation method of a reinforced 6061aluminum matrix composite material comprises steps as follows: a magnesium borate whisker and 6061 aluminum alloy powder are mixed to from a mixture of the magnesium borate whisker and the 6061 aluminum alloy powder with the volume fraction accounting for 5%-20% of the total volume, and sequentially placed into a ball mill for ball milling, wherein the ball-milling parameters are set as follows: the ratio of balls to materials is 10:1, the revolving speed of the ball mill is 150 r / min, the ball-milling time is 10 hours, the ball mill works in the manner that the ball mill forwards rotates for 600s, stops working for 60s, reversely rotates for 600s and stops working for 60s, and such circulation is repeated; ball-milling powder is placed in a mold cavity and pressed into a prepressing blank at the temperature of 100 DEG C; the prepressing blank is heated slowly to 510 DEG C and kept warm for 30 minutes, finally, the prepressing blank is uniformly extruded at an extrusion ratio of 9:1 and at the speed of 10min / s, and a composite extrusion rod with a smooth surface is prepared; and a workpiece is subjected to solid solution and ageing treatment, the solid solution treatment temperature is 520 DEG C, heat preservation is performed for 50min, water quenching is performed at the indoor temperature, and ageing treatment is performed at the temperature of 170 DEG C for 10 hours.

Description

technical field [0001] The invention relates to a preparation process of 6061 aluminum-based composite material. Background technique [0002] Discontinuously reinforced aluminum matrix composites with reinforcements such as whiskers, particles, and short fibers have the advantages of high specific strength, specific stiffness, high fatigue strength, good wear resistance, relatively simple composite process, and flexibility. dominant in composite materials. Aluminum matrix composites have become important in aviation, aerospace, automobiles, ships, sports and other fields because of their simpler preparation process, lower preparation cost, easy secondary processing, and isotropy of composite materials. structural materials. The preparation methods of whisker-reinforced aluminum matrix composites mainly include casting method and powder metallurgy method. Among them, the extrusion casting method does not require high interface wettability. In the process of preparing compo...

Claims

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Application Information

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IPC IPC(8): C22C47/14C22C49/06C22C49/14C22C101/06
Inventor 喇培清马国俊刘国龙马志龙
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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