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Easy-cutting type particle-reinforced aluminum-matrix composite and preparation method thereof
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A technology for particle-reinforced aluminum and composite materials, applied in the field of aluminum-based composite materials, can solve the problems of difficult to guarantee machining accuracy, complicated preparation process, affecting cutting processing, etc., and achieve good mechanical properties and cutting properties, simple preparation process, and mechanical properties. improved effect
Inactive Publication Date: 2016-11-16
SHANGHAI JIAO TONG UNIV +1
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Problems solved by technology
At present, the commonly used aluminum matrix composites are prepared by adding particles to the 2xxx and 6xxx conventional aluminum alloy matrices. This type of aluminum matrix composites has defects such as difficult control of interface reactions and uneven distribution of reinforcing particles, which affects the quality of aluminum matrix composites. mechanical properties
At the same time, since the size of the added particles is usually in the micron level, the probability of being crushed and falling off by the cutting edge is relatively high in the cutting deformation zone, resulting in poor surface finish and difficult to guarantee the processing accuracy, and the reinforced particles have sharp edges and corners. The scraping and plowing of the tool is very serious, causing the tool to be severely worn in a short period of time; the base aluminum alloy is easy to stick to the tool during processing, and it is not easy to break chips, which affects the cutting process
In addition, the preparation process of using external particles is complicated and the cost is high, which is not conducive to popularization and application
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Embodiment 1
[0020] The components and their mass percentages of the present invention are: Mg 1%, Cu 2%, Sn 0.1%, Bi 0.1, TiB 2 0.1%, the balance is Al.
[0021] Comprise the following steps during preparation:
[0022] A, according to above-mentioned composition and weight percent content, calculate the consumption of required raw material; Said raw material is industrial pure Al, industrial pure Mg, industrial pure Sn, industrial pure Bi, Al-Cu master alloy, KFB 4 and K 2 TiF 6 ;
[0023] B. Add industrial pure Al into the crucible, after it is heated and melted, put KFB 4 、K 2 TiF 6 The mixed salt formed by mixing evenly is added to the aluminum melt, so that the mixed salt reacts with the aluminum melt. During the in-situ reaction, mechanical stirring is used throughout the whole process to speed up the reaction process and improve the uniformity of the reaction. After the reaction is complete, remove the reaction by-products located in the upper layer of the melt in the crucib...
Embodiment 2
[0027] The components and their mass percentages of the present invention are: Mg 2%, Cu 3%, Sn 0.5%, Bi 0.5%, TiB 2 10%, the balance is Al. Its preparation is with embodiment 1.
[0028] TiB in composite 2 The size of the particles is 20-100nm, the shape of the particles is mainly hexagonal, and the particles are dispersed in the matrix. Mechanical properties of materials (test standard: GBT 228.1-2010): σ b =540MPa, σ 0.2 =460MPa, δ=5%, E=81GPa. Easy cutting, fine cutting, high surface finish.
Embodiment 3
[0030] The components and their mass percentages of the present invention are: Mg 3%, Cu 4%, Sn 1.5%, Bi 1%, TiB 2 20%, the balance is Al. Its preparation is with embodiment 1.
[0031] TiB in composite 2 The size of the particles is 20-100nm, the shape of the particles is mainly hexagonal, and the particles are dispersed in the matrix. Mechanical properties of materials (test standard: GBT 228.1-2010): σ b =580MPa, σ 0.2 =485MPa, δ=4%, E=90GPa. Easy cutting, fine cutting, high surface finish.
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Abstract
The invention discloses an easy-cutting type particle-reinforced aluminum-matrix composite and a preparation method thereof. The composite comprises the following components in percentage by mass: 1-3% of Mg, 2-4% of Cu, 0.1-1.5% of Sn, 0.1-1.0% of Bi, 0.1-20% of TiB2 reinforced particles, and the balance A1. The preparation method comprises the following steps: feeding industrial pure aluminum (Al) in a crucible during preparing, and heating to melt; adding mixed salt formed by uniformly mixing KFB4 and K2TiF6 to a melt, and mechanically stirring to enable high-temperature synthetic reaction of the mixed salt and the aluminum melt; removing side reaction products after the reaction is fully performed; sequentially adding industrial pure Mg, pure Sn, pure Bi and Al-Cu intermediate alloy; degasing and refining; pouring to form a casting blank; extruding the casting blank into a bar; and then performing solution and aging treatment to obtain the corresponding composite. The particle-reinforced aluminum-matrix composite is high in mechanical performance and high in cutting performance.
Description
technical field [0001] The invention relates to an aluminum-based composite material, in particular to a free-cutting particle-reinforced aluminum-based composite material and a preparation method thereof. Background technique [0002] Aluminum matrix composites have high specific stiffness, high specific strength and low thermal expansion coefficient, and are widely used in aviation, aerospace, transportation and weaponry and other fields. At present, the commonly used aluminum matrix composites are prepared by adding particles to the 2xxx and 6xxx conventional aluminum alloy matrices. This type of aluminum matrix composites has defects such as difficult control of interface reactions and uneven distribution of reinforcing particles, which affects the quality of aluminum matrix composites. mechanical properties. At the same time, since the size of the added particles is usually in the micron level, the probability of being crushed and falling off by the cutting edge is rel...
Claims
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Application Information
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