Orientated-textured Ti2AlC-Mg-based composite material and hot-extrusion preparation method thereof

A composite material and texturing technology, applied in the field of directional textured Ti2AlC-Mg based composite material and its hot extrusion preparation

Active Publication Date: 2017-08-15
山东高密翔宇车桥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the directional texturing of MAX materials reinforced metal matrix composites, but there have been a lot of reports on the directional texturing of pure MAX materials

Method used

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  • Orientated-textured Ti2AlC-Mg-based composite material and hot-extrusion preparation method thereof
  • Orientated-textured Ti2AlC-Mg-based composite material and hot-extrusion preparation method thereof
  • Orientated-textured Ti2AlC-Mg-based composite material and hot-extrusion preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] For 10vol% Ti 2 The AlC-AZ91D material was heat-treated at 400°C for 24 hours to make the Mg alloy uniformly solutionized. Directional textured Ti was prepared at 250-℃ with extrusion ratio of 12:1 and rate of 1 / s 2 AlC / Mg based composites results show that Ti 2 AlC grains do not appear cracked and detached, such as figure 2 shown. and figure 1 Ti in initial state composite 2 AlC is arranged at the α-Mg grain boundary compared to Ti 2 AlC particles are distributed along the extrusion direction. In addition, some submicron and nanometer Ti 2AlC grains are dispersed into Mg grains, which is beneficial to greatly improve the mechanical properties of the composites. ⊥Extrusion direction and / / extrusion direction, the compressive strength of the composite material is 500MPa and 450MPa respectively; the tensile strength of the composite material is 250MPa and 370MPa respectively.

Embodiment 2

[0025] For 15vol% Ti 2 The AlC-AZ91D material was heat-treated at 420°C for 36 hours to make the Mg alloy uniformly solutionized. Orientation-textured Ti 2 AlC-Mg based composites. High-energy CT scans and reconstructions were carried out before and after hot extrusion of composite materials, as shown in image 3 shown. Ti 2 The AlC particles are clearly oriented, from the isotropic uniformity of the casting state to the oriented arrangement of the particle base along the hot extrusion direction.

Embodiment 3

[0027] For 20vol% Ti 2 AlC-Mg based composites were heat treated at 420℃ for 36h to make the Mg alloy uniformly solutionized. Orientation-textured Ti was prepared at 270 °C with an extrusion ratio of 14:1 and a rate of 0.5 / s 2 AlC-Mg based composites. For initial state magnesium alloy and 20vol%Ti 2 AlC-Mg based composites were subjected to the same hot extrusion process, and XRD scans were carried out along the extrusion direction and perpendicular to the extrusion direction, as shown in Fig. Figure 4 (a) and (b) shown. ⊥ extrusion direction, 10vol% Ti compared to pure extruded Mg alloy 2 The intensity of the Mg(002) basal plane diffraction peak in the AlC-Mg-based composite material weakens or even disappears; / / extrusion direction, Ti 2 The AlC(002) basal plane diffraction peak appears and the Mg(002) basal plane diffraction peak is obviously enhanced. It can be seen that under the hot extrusion process, Ti 2 Orientation of AlC particles occurs and strengthens the o...

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Abstract

The invention discloses an orientated-textured Ti2AlC-Mg-based composite material and a hot-extrusion preparation method thereof. The preparation method of the material comprises a heat treatment step and a hot-extrusion step: in the first step, a Ti2AlC-Mg-based composite material prepared through powder metallurgy or stirring casting is subjected to heat treatment for 10-36h at 400-450 DEG C to enable an Mg alloy to be uniformly solutionized; and in the second step, the orientated-textured Ti2AlC / Mg-based composite material is prepared at 250-320 DEG C, in different extrusion ratios and at a speed of 0.5-20mm / s. The microstructure of the material is obtained through rearranging the orientations of hexagonal crystal ceramic phases Ti2AlC, Ti2AlC(0001) base surfaces are orientated-distributed in an Mg alloy matrix in an extrusion direction, and the behavior promotes the orientation-texturing of the Mg-based alloy. The composite material has the remarkable anisotropic characteristics of being high in strength, damping, wear resistance and the like, and can be widely used for key devices in the fields of aerospace, military industry, transportation, mechanical manufacturing and the like.

Description

technical field [0001] The invention relates to a directional textured Ti 2 AlC-Mg based composite material and its hot extrusion preparation method. Background technique [0002] Due to the limitations of the performance of traditional single metal and ceramic materials, it is difficult to meet the needs of the rapidly developing advanced manufacturing industry for the use of material performance. The emergence of metal matrix composites (MMC) with high specific strength and high specific modulus characteristics has caused widespread attention. Compared with the current main aluminum, copper and iron-based composite materials, magnesium-based composite materials (the density of magnesium is only 1.74g cm -3 ) has higher specific strength, specific stiffness, better damping, shock absorption and noise reduction performance, electromagnetic interference shielding performance and good recyclability (references: Schaller, R., Journal of Alloys and Compounds, 2003, [131 -135]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/00C22C32/00C22C29/06
CPCC22C23/00C22C29/067C22C32/0052C22F1/06
Inventor 于文波黄振莺翟洪祥李世波周洋
Owner 山东高密翔宇车桥有限公司
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