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Preparation method of ultrafine-grain titanium matrix composite material by using mushy-zone titanium alloy as matrix

A technology of titanium-based composite materials and titanium alloys, applied in the field of plastic processing of materials, to achieve the effects of improved adaptability, short process flow and high efficiency

Active Publication Date: 2014-05-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant reports on the microstructure and properties of ultrafine-grained titanium-based composites at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment relates to a preparation method of an ultrafine-grained titanium-based composite material based on a two-phase region titanium alloy, including the following specific steps: the matrix alloy of the titanium-based composite material is selected from TC4, TiC (vol0%), rare earth Oxide particles (vol1.16%), TiB (vol3.64%) fiber hybrid reinforced composite material; after the material is smelted by vacuum self-consumption, it is forged into a Φ76mm rod at 1200 °C above the phase transition point; the original structure crystal Coarse grain, the grain size is 20μm; the titanium-based composite material is wire-cut into a 10×10×140mm sample, the head chamfer is 120°, and the surface roughness Ra≤3.2μm; the mold channel angle is 120°; the above The extruded sample and the mold are preheated to 200°C, and the graphite lubricant is evenly applied on the surface of the sample and the inner wall of the mold channel, with a thickness of 0.05-0.1mm; the mold is instal...

Embodiment 2

[0027]This embodiment relates to a preparation method of an ultra-fine-grained titanium-based composite material based on a two-phase region titanium alloy, including the following specific steps: selecting the titanium-based composite material as (TiB+TiC+La 2 o 3 ) / TC18, TiB (Vol8.16%), TiC (Vol1.26%), La 2 o 3 (Vol0.58%), the angle of the mold channel is 90 °; others are the same as in Example 1, after completing the deformation of the ECAP4 pass, the superfine-grained titanium-based composite material with a smooth surface is obtained, and the grain size is changed from the original 22 μm fine When the thickness reaches 500nm, the yield strength increases from the initial 990MPa to 1250MPa.

Embodiment 3

[0029] This example relates to a preparation method of an ultra-fine-grained titanium-based composite material based on a two-phase region titanium alloy, which includes the following specific steps: select the titanium-based composite material as the (TiB+TiC) / TC11 matrix, and TiB(Vol2. 5%), TiC (Vol2.5%); Die channel angle is 120 °; Others are the same as embodiment 1, after finishing the deformation of ECAP4 pass, obtain the superfine-grained titanium-based composite material with smooth surface, grain size It has been refined from the original 17μm to 550nm, and the yield strength has increased from the initial 970 to 1240MPa.

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Abstract

The invention relates to a preparation method of an ultrafine-grain titanium matrix composite material by using a mushy-zone titanium alloy as a matrix. The preparation method comprises the following steps: carrying out hot working of a titanium matrix composite material; cutting to form a blank material, and polishing; simultaneously preheating a sample and a die, and uniformly smearing the surface of the sample and the inner wall of the die with a graphite lubricant; respectively carrying out heating and heat insulation of the die and the sample; putting the sample in a die channel to make the sample completely go through the channel corner of the equal-diameter corner extrusion die, and cooling the sample with water to complete a primary extruding technology; and machining the sample, carrying out 90DEG anticlockwise rotation, beveling the head, and carrying out 2-4 time equal-diameter bending channel extrusion deformation to obtain the ultrafine-grain titanium matrix composite material. The preparation method realizes the strength and plasticity deformation of the titanium matrix composite material, effectively refines the internal crystal grain size, has the advantages of short process flow, easy operation, high efficiency, low cost and strong adaptability, and can be used in the titanium matrix composite material processing field.

Description

technical field [0001] The invention belongs to the technical field of plastic processing of materials, and in particular relates to a preparation method of an ultrafine-grained titanium-based composite material with a two-phase region titanium alloy as a matrix. Background technique [0002] Due to their excellent mechanical and physical properties, titanium and titanium alloys have been widely used in various economic fields such as aviation, aerospace, energy, electric power, petroleum, chemical industry, biology, and medicine. The United States, Russia, Japan and European countries have started the industrialization of sponge titanium and the mass production of titanium alloy materials since the 1940s. my country also started the trial production of sponge titanium in 1958, and now it has formed a complete titanium industry. system. However, when titanium alloy materials are developed to the highest limit of a certain performance, it is difficult to improve the performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00C22C32/00C22C49/11
Inventor 吕维洁李九霄韩远飞薛晓冰王立强张志伟覃继宁张荻
Owner SHANGHAI JIAO TONG UNIV
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