High-strength and ductile multicomponent precision resistance alloys and fabrication methods thereof

Patent metadata

Field	Value
Publication number	US-11851735-B2
Application number	US-202218004662-A
Country	US
Kind code	B2
Filing date	Jun 7, 2022
Priority date	Sep 30, 2021
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A type of high-strength and ductile multicomponent precision resistance alloys and fabrication methods thereof are provided. The alloys are composed of the following components by atomic percentage: Ni 45-60%, Cr 15-30%, Fe 5-20%, Al 5-15%, Mn 3-5%, Cu 0.2-3%, Si 1-5%. Particularly, the sum of the atomic percentages of Mn, Cu and Si is ≤13% and ≥4.2%, the sum of the atomic percentages of Ni, Cr, Fe and Al is ≥70% and ≤95.8%, and the sum of the atomic percentages of all the components is 100%. The multicomponent alloys prepared by the methods exhibit face-cantered cubic matrix and possess high strength and good ductility; further, they have high resistivity and excellent resistivity stability in wide temperature ranges below 773 K.

First claim

The invention claimed is:

1. A high-strength and ductile multicomponent precision resistance alloy, consisting essentially of the following components by atomic percentage:
45-60% of Ni,
15-30% of Cr,
5-20% of Fe,
5-15% of Al,
3-5% of Mn,
0.2-3% of Cu, and
1-5% of Si;
wherein the sum of the atomic percentage of Ni, Cr, Fe and Al is ≥70% and ≤95.8%, the sum of the atomic percentage of Mn, Cu and Si is ≥4.2% and ≤13%, and the sum of the atomic percentage of all components is 100%;
wherein the alloy has a yield strength from 300 MPa to 900 MPa, an ultimate tensile strength from 700 MPa to 1200 MPa, and a total elongation from 30% to 70%, and the alloy has a resistivity between 120 μΩ·m to 160 μΩ·cm and a temperature coefficient of resistivity between +300 ppm/K to −300 ppm/K in a temperature range below 773 K, and the alloy has a face-centered cubic (FCC) phase structure.

2. A method of fabricating the alloy of claim 1 , comprising:
batching each alloy component according to atomic percentage;
melting all the components together in a vacuum or noble gas protection to prepare an as-cast alloy ingot; and
hot-rolling the as-cast alloy, followed by homogenization, cold-rolling, annealing and aging to obtain an alloy.

3. The method of claim 2 , wherein the melting is conducted at a temperature between 1623-2473 K.

4. The method of claim 2 , wherein the melting is carried out at a furnace having a vacuum degree of 1-0.0001 Pa or a noble gas condition with noble gas pressure between 0.000001-5 MPa.

5. The method of claim 2 , wherein the hot-rolling is a multi-pass hot-rolling procedure with a hot-rolling temperature between 1173-1473 K, a thickness reduction ratio per pass ≤25% and a total thickness reduction ratio of 30-80%.

6. The method of claim 2 , wherein the homogenization is performed at a temperature between 1223-1573 K for around 30-600 minutes.

7. The method of claim 2 , wherein the cold-rolling is a multi-pass cold-rolling procedure with a thickness reduction ratio per pass ≤25% and a total thickness reduction ratio between 40-90%.

8. The method of claim 2 , wherein the annealing is conducted at the temperature range from 773-1473 K for 2-600 minutes, and the annealing is performed under a vacuum condition with a vacuum degree between 1-0.0001 Pa or noble gas condition with a noble gas pressure between 0.000001-5 MPa.

9. The method of claim 2 , wherein the aging treatment is carried out at an aging temperature between 573-973K for 2-1000 hours; further, the aging treatment is performed under a vacuum condition with a vacuum degree of 1-0.0001 Pa or noble gas condition with a noble gas pressure of 0.000001-5 MPa.

Assignees

• Univ Central South

Inventors

• Li Zhiming
• Zhu Shuya
• Yan Dingshun
• Gan Kefu
• Zhang Yong

Classifications

• C22C19/058 Primary

  without Mo and W · CPC title

• C22C1/023

  Alloys based on nickel · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• C22C30/02

  containing copper · CPC title

• C22F1/02

  in inert or controlled atmosphere or vacuum (adjusting the composition of the atmosphere C21D1/76) · CPC title