Title: Oxidation resistant high-entropy alloys

Abstract

Disclosed herein are new face-centered cubic (f.c.c.) high-entropy alloys with compositions (in atomic %) of Fe.sub.aNi.sub.bMn.sub.cAl.sub.dCr.sub.eC.sub.f where a is between 37-43 atomic %, b is between 8-14 atomic %, c is between 32-38 atomic %, d is 4.5-10.5 atomic %, e is between 2.5-9 atomic % and f is between 0-2 atomic %. The undoped alloy has strength of 159 MPa and 40% elongation to failure, but the doped, carbon-containing alloy having 1.1 atomic percent carbon has yield strength of 360 MPa, an ultimate tensile strength (UTS) of 1200 MPa and 50% elongation to failure at room temperature. At 700.degree. C., the yield strength is 214 MPa with 24% elongation to failure. Thus, the present alloy may replace austenitic stainless steels in applications where better strength is needed at both room temperature and elevated temperature in an oxidation resistant alloy.

Inventors:

Baker, Ian; Wang, Zhangwei

Issue Date:

2019-01-29

Research Org.:

Dartmouth College, Hanover, NH (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1500037

Patent Number(s):

10190197

Application Number:

15/374,322

Assignee:

The Trustees of Dartmouth College (Hanover, NH)

Patent Classifications (CPCs):

C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS

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C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

C21D2201/02 - Superplasticity
C21D2211/004 - Dispersions
C21D6/004 - {containing Cr and Ni}
C21D6/005 - {containing Mn}
C21D8/0236 - {Cold rolling}
C21D8/0273 - {Final recrystallisation annealing}

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS

C22C30/00 - Alloys containing less than 50% by weight of each constituent
C22C33/04 - by melting
C22C38/04 - containing manganese
C22C38/06 - containing aluminium
C22C38/40 - with nickel
C22C38/58 - with more than 1.5% by weight of manganese

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS

H01F1/012 - {adapted for magnetic entropy change by magnetocaloric effect, e.g. used as magnetic refrigerating material

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DOE Contract Number:  

FG02-07ER46392

Resource Type:

Patent

Resource Relation:

Patent File Date: 2016 Dec 09

Country of Publication:

United States

Language:

English