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Tenacious metallic nano-crystalline bulk material with high hardness and high strength, and its manufacturing method

A technology of nanocrystals and manufacturing methods, applied in the field of metals, can solve the problems of inability to obtain nanoscale materials, and achieve the effect of easy manufacturing

Inactive Publication Date: 2005-10-19
NANO TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is impossible to obtain a material whose particle size is miniaturized to the nanometer scale using this usual method

Method used

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  • Tenacious metallic nano-crystalline bulk material with high hardness and high strength, and its manufacturing method
  • Tenacious metallic nano-crystalline bulk material with high hardness and high strength, and its manufacturing method
  • Tenacious metallic nano-crystalline bulk material with high hardness and high strength, and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] figure 1 It is M which means that 15 atomic % of other elements (A), such as carbon (C), niobium (Nb), tantalum (Ta), titanium (Ti), etc., are added to the powder of each element of iron, cobalt, and nickel. 85 A 15 (Atomic %) (M=iron, cobalt or nickel) elemental state mixed powder, a chart of the average grain size change of each element of iron, cobalt, and nickel after 50 hours of mechanical alloying (MA) treatment.

[0054] Here, D Fe 、D Co 、D Ni are the average grain sizes (nm) of iron, cobalt, and nickel, respectively. It can be seen from this figure that the refinement of crystal particles of iron, cobalt, and nickel elements is further effectively promoted by carbon, niobium, tantalum, titanium, etc., and all three elements can be refined to a particle size of several nanometers.

[0055] In addition, in the case of copper, aluminum, and titanium, the addition of other elements promotes the miniaturization of crystal particles, and among these elements, car...

Embodiment 2

[0064] Figure 4 It means Fe obtained by MA treatment of iron, chromium, nickel, tantalum elemental mixed powder and iron nitride for 100 hours 64-y Cr 18 Ni 8 Ta y N 10 (Atomic %) (y = 0 to 15) A graph showing the relationship between the average crystal grain size D (nm) of the sample and the amount of tantalum added y (atomic %).

[0065] It can be seen from the figure that in the two-component system material of iron and added elements, the element with a large grain boundary segregation factor β has a large effect on the miniaturization of crystal particles during MA treatment in the multi-component material with iron.

Embodiment 3

[0067] Mechanical alloying (MA) treatment of elemental powders of iron and carbon (MA treatment time is 200 hours) to obtain Fe 99.8 C 0.2 (mass%) powder sample. Next, after vacuum sealing it into a stainless steel pipe (Sheath), sheath rolling (Sheath Rolling) (forming pressure: 98MPa, forming temperature: 900°C) was performed to obtain a solidified formed body (bulk) as shown in Table 1. .

[0068] sample

D (nm)

Hv

Oxygen (mass%)

SR forming sheet *

23

980

0.485

[0069] The value of D is calculated by the Scherrer formula.

[0070] * The thickness is about 1.4mm.

[0071] Seen from above-mentioned embodiment 3 and table 1, according to the present invention, by MA treatment reaches nanoscale superfine crystal particle, its Vickers hardness value Hv shows that is greater than or equal to high carbon steel with martensitic structure The hardness of the quenched material.

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Abstract

The invention provides a high hard, strength and tough nano-crystal metal bulk material and a preparation process thereof. The metal bulk material comprises an aggregate of metal nano-crystal grains, wherein an oxide, nitride, carbide, boride or the like of a metal or semimetal exists as a crystal grain growth inhibitor between and / or in the nano-crystal grains. The respective fine powders of nano-metal bulk material-forming components are mechanically alloyed (MA), using a ball mill or the like, thereby preparing nano-metal powders. Then, hot forming-by-sintering treatment such as spark plasma sintering, extrusion and rolling or explosive forming is applied to the powders to obtain a high hard, strength and tough nano-crystal metal bulk material.

Description

technical field [0001] The present invention relates to metals, especially high-hardness, high-strength, and tough nanocrystalline metal bulk materials (bulk materials) and methods for making them. Background technique [0002] As shown in the Petch relationship, the strength and hardness of metal materials increase as the crystal particle size D decreases. This relationship still holds true until D is around tens of nanometers, so the crystal particle size is ultrafine to nanometers. Scale level is one of the most important means of strengthening metal materials. [0003] On the other hand, most metals exhibit a peculiar phenomenon called superplasticity in the temperature range of 0.5Tm (Tm: melting point (K)) or higher when the crystal grain size is ultrafine to the nanoscale level. [0004] Utilizing this phenomenon, deformation processing can be performed at a relatively low temperature for materials that are very difficult to plastically process due to their high melt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/00
CPCB22F2003/1032C22C21/12B22F3/006C22C38/48C22C38/001C22C14/00B22F2998/10C22C2200/04C22C9/01C22C38/02C22C38/04B22F2998/00C22C38/18B22F3/08B22F3/20B22F9/005B22F3/14B22F3/105
Inventor 三浦春松宫尾信昭小川英典小田和生胜村宗英水谷胜
Owner NANO TECH INST
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