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High-strength and tough carbon nanotube-reinforced aluminum composite material with heterogeneous structure and preparation method thereof

An aluminum composite material and carbon nanotube technology, which is applied in the field of high-strength and tough carbon nanotube-reinforced aluminum composite materials and their preparation, can solve the problems of inability to effectively relax due to stress concentration in the brittle zone, insignificant improvement in toughness, and decrease in yield strength, etc. , to achieve good toughness, inhibit local strain concentration, and make up for the decrease in yield strength

Active Publication Date: 2021-07-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the size of the constructed ductile zone is more than tens of microns, the stress concentration of the brittle zone in the ductile zone cannot be effectively relaxed, so the improvement of toughness is not obvious, and the introduction of a large number of low-strength toughness zones makes the composite The strength of the material, especially the yield strength, is greatly reduced

Method used

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  • High-strength and tough carbon nanotube-reinforced aluminum composite material with heterogeneous structure and preparation method thereof
  • High-strength and tough carbon nanotube-reinforced aluminum composite material with heterogeneous structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]450g of pre-alloyed 2009Al powder (composed of Al powder, Mg powder, Cu copper element powder) with an average size of 10μm and multi-walled CNT with a content of 4vol.% were evenly mixed and added to the ball mill, and 2wt.% of hard Fatty acid is used as a process control agent, feed argon and cooling water, and ball mill at 350r / min for 2 hours; add 400g of 3vol.%CNT / 2009Al composite powder to the composite material powder, and run at 300r / min for 2 hours ; Add 150 g of pre-alloyed 2009Al powder with an average size of 10 μm to the composite material powder, and ball mill for 0.5 h at a rotational speed of 200 r / min to obtain the final composite material powder. Subsequently, the composite ingot was obtained by cold pressing at 50MPa and vacuum hot pressing at 540°C and 80MPa; the ingot was subjected to hot extrusion with an extrusion ratio of 16:1, and finally a 3vol.%CNT / 2009Al composite with a heterogeneous structure was obtained. Material( figure 2 ).

[0033] T...

Embodiment 2

[0038] 300g of 5083Al alloy powder with an average size of 10 μm and multi-walled CNT with a content of 4vol.% were uniformly mixed and then added to the stirring ball mill, 2wt.% of stearic acid was added as a process control agent, and argon and cooling water were introduced. Ball milling at 400r / min for 2 hours; add 600g of 3vol.%CNT / 5083Al composite powder to the composite powder, and run at 400r / min for 2 hours; add 100g of the average size of 10μm pre-alloy to the composite powder The melted 5083Al powder was ball milled for 0.5h at a rotational speed of 200r / min to obtain the final composite material powder. Subsequently, the composite ingot was obtained by cold pressing at 40MPa and vacuum hot pressing at 500°C and 80MPa; the ingot was subjected to hot extrusion with an extrusion ratio of 16:1, and finally a 3vol.%CNT / 5083Al composite with a heterogeneous structure was obtained. Material. The yield strength of the composite material reaches 500MPa, the tensile strengt...

Embodiment 3

[0042] 363g of 6061Al alloy powder with an average size of 10 μm and multi-walled CNT with a content of 4vol.% were uniformly mixed and added to the stirring ball mill, 2wt.% of stearic acid was added as a process control agent, and argon and cooling water were introduced. Ball milling under 300r / min for 2 hours; Add 91g 3vol.%CNT / 6061Al composite material powder in this composite material powder, move 1.5 hours under 300r / min; Add 182g 1.5vol.%CNT / 6061Al composite material powder in this composite material powder 6061Al composite material powder, run at 300r / min for 1.5 hours; then add 364g of pre-alloyed 6061Al powder with an average size of 10μm to the composite material powder, and ball mill at a speed of 150r / min for 0.5h to obtain the final composite material powder . Subsequently, the composite material ingot was obtained by cold pressing at 40MPa and vacuum hot pressing at 580°C and 100MPa; the ingot was subjected to hot extrusion with an extrusion ratio of 16:1 to obt...

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Abstract

The invention discloses a high-strength and tough carbon nanotube-reinforced aluminum-based composite material with a non-uniform structure and a preparation method thereof, belonging to the technical field of composite material preparation. In the process of ball milling, pre-grind high-content carbon nanotube / aluminum composite material powder, then add low-content carbon nanotube / aluminum composite material powder for ball milling at regular intervals, and finally add aluminum alloy powder, thus in the cold Gradient change of carbon nanotube content formed in the micro-area of ​​composite material under welding action. In addition, due to the short ball milling time of the composite material powder added later, the degree of grain refinement is small, thereby forming a grain size gradient distribution of micro-domains. The powder is subjected to subsequent densification and secondary processing to obtain the final composite material, which exhibits much higher strength and toughness than the homogeneous structure composite material.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a high-strength and tough carbon nanotube-reinforced aluminum composite material with a non-uniform structure and a preparation method thereof. Background technique [0002] Carbon nanotubes (CNTs) have extremely high mechanical properties (tensile strength >10GPa, elastic modulus ~1GPa) and large aspect ratio, and are considered to be ideal reinforcements for composite materials. Adding a small amount of carbon nanotubes to the aluminum alloy matrix is ​​expected to prepare high-strength, high-modulus aluminum matrix composites, which have broad application prospects in the aerospace field. However, while the addition of carbon nanotubes increases the strength and modulus of the composite material, it also inevitably deteriorates the toughness of the composite material, mainly due to two reasons. One is that the carbon nanotubes dispersed in the aluminu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C21/00
CPCC22C1/05C22C21/00C22C26/00C22C2026/002
Inventor 刘振宇马宗义肖伯律王全兆王东倪丁瑞张星星
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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