Preparation method of double-scale crystalline grain Ti-6Al-4V material

A ti-6al-4v, dual-scale technology, applied in the field of titanium alloys, can solve the problems of poor repeatability, unstable material mechanical properties, difficult to control the volume percentage of grain size, etc., to achieve short sintering time and inhibit grain length. The effect of large and excellent comprehensive mechanical properties

Inactive Publication Date: 2012-10-03
SOUTH CHINA UNIV OF TECH
View PDF3 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the large plastic deformation method can prepare defect-free dual-scale grain Ti-6Al-4V materials, it also has certain limitations.
Through the large plastic deformation method, it is difficult to control the gr

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a dual-scale grain Ti-6Al-4V material adopts a forming method combining high-energy ball milling and spark plasma sintering technology, which includes the following steps and process conditions:

[0030] Step 1: Preparation of ultrafine / nanocrystalline Ti-6Al-4V powder by high energy ball milling

[0031] Spherical Ti-6Al-4V powder with grain size > 1 μm and purity > 99.97% prepared by commercially available plasma rotating electrode atomization method was used as raw material, and ball milled in the ball mill tank of QM-2SP20-CL planetary high-energy ball mill. Vacuum the ball mill tank and fill it with high-purity argon (99.99%) as a protective atmosphere. The material of the tank body and the grinding ball are all stainless steel, the ratio of ball to material is 12:1, and the speed is 228r / min. Take powder at 5h and 20h respectively. 5h to obtain ultra-fine crystal powder, the grain size distribution range is between 100nm~900nm, 20h to obt...

Embodiment 2

[0044] A preparation method of a dual-scale grain Ti-6Al-4V material adopts a forming method combining high-energy ball milling and spark plasma sintering technology, which includes the following steps and process conditions:

[0045] Step 1: Preparation of ultrafine / nanocrystalline Ti-6Al-4V powder by high energy ball milling

[0046] Raw material powder, equipment and process condition are the same as embodiment 1. Take powder at 5h and 10h respectively, obtain ultra-fine crystal powder at 5h, and its grain size distribution range is between 100nm and 900nm, and obtain nanocrystalline powder at 10h, and its grain size distribution range is between 50nm and 100nm;

[0047] Step 2: Mixing of Ti-6Al-4V powders with different grain sizes

[0048] The ultra-fine crystal powder obtained by high-energy ball milling and the nano-crystalline powder obtained by high-energy ball milling are mixed in a mass ratio of 1:4 and uniformly mixed;

[0049] Step 3: Spark plasma sintering

[...

Embodiment 3

[0059] A preparation method of a dual-scale grain Ti-6Al-4V material adopts a forming method combining high-energy ball milling and spark plasma sintering technology, which includes the following steps and process conditions:

[0060] Step 1: Preparation of ultrafine / nanocrystalline Ti-6Al-4V powder by high energy ball milling

[0061] Raw material powder, equipment and process condition are the same as embodiment 1. Take powder at 5h and 50h respectively, obtain ultra-fine crystal powder at 5h, and its grain size distribution range is between 100nm and 900nm, and obtain nanocrystalline powder at 50h, and its grain size distribution range is between 10nm and 60nm;

[0062] Step 2: Mixing of Ti-6Al-4V powders with different grain sizes

[0063] The ultra-fine crystal powder obtained by high-energy ball milling and the nano-crystalline powder obtained by high-energy ball milling are mixed in a mass ratio of 1:9 and uniformly mixed;

[0064] Step 3: Spark plasma sintering

[0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Lengthaaaaaaaaaa
Grain sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a double-scale crystalline grain Ti-6Al-4V material. The preparation method adopts a forming way combining a high energy ball milling process with a spark plasma sintering process, and comprises the following steps of: firstly, taking powder in a segmentation manner in the whole high energy ball milling process to obtain powder with different refining degrees, wherein the grain size distribution range of the ultrafine crystal powder is controlled to be between 100nm and 1 mu m, and the grain size distribution range of the nanocrystalline powder is controlled to be between 10nm and 100nm; then, compounding and uniformly mixing one of the powder serving as the raw material and the ultrafine crystal powder with the nanocrystalline powder according to any mass ratio; and finally, optimizing the spark plasma sintering process. By controlling the mixing proportion of the two powder, the proportion of a rough crystal zone and a fine crystal area in a double-scale crystalline grain Ti-6Al-4V material tissue can be accurately controlled, and the defect that the proportion of rough and fine crystals are difficult to be accurately controlled is overcome; and meanwhile, by optimizing the sintering parameters of the spark plasma sintering process, the material has an excellent comprehensive mechanical property.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a method for preparing a double-scale grain Ti-6Al-4V material. Background technique [0002] With the reduction of the cost of titanium alloy preparation, the material is not only used in the traditional aerospace and marine engineering fields, but also in the civil industry fields such as automobiles and construction. At the same time, with the development of science and technology, the requirements for the mechanical properties of titanium alloys are getting higher and higher. The existing titanium alloys can no longer meet the requirements of the rapid development of aerospace, automobile, construction, marine engineering and other industries, and more research and development is needed. High-performance titanium alloy material. Ti-6Al-4V alloy is a representative α+β two-phase titanium alloy. Its consumption accounts for more than 50% of the total output of titanium...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22C14/00C22C1/04
Inventor 龙雁张红英李颖王韬
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap