alloys - 2025 ACF Regionals

Question

Brian Cantor led a team that developed one of these materials consisting of an equal mixture of five first row transition metals. For 10 points each:

[10e] Name these materials said to be “high-entropy” or “multi-component” when they contain at least five different metals. More common two-component examples of these materials include bronze.

ANSWER: alloys [accept high-entropy alloys or multi-component alloys]

[10h] The Cantor alloy undergoes a phase separation into metallic and intermetallic phases, an example of a decomposition described by this term. The zero set of the second derivative of Gibbs free energy with respect to composition percentage defines a curve described by this term.

ANSWER: spinodal [accept spinodal decomposition or spinodal curve]

[10m] The “sluggish diffusion” effect in high-entropy alloys results from unequal lattice potential energies around the “vacancy” type of these sites. Other types of these sites may be classified as “substitutional” or “interstitial.”

ANSWER: point defects [or crystallographic point defects; accept vacancy defects or substitutional defects or interstitial defects]

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Summary


Florida	2025-02-01	Y	3	13.33	100%	33%	0%
Great Lakes	2025-02-01	Y	6	11.67	100%	17%	0%
Lower Mid-Atlantic	2025-02-01	Y	6	11.67	100%	17%	0%
Midwest	2025-02-01	Y	2	20.00	100%	50%	50%
North	2025-02-01	Y	3	10.00	100%	0%	0%
Northeast	2025-02-01	Y	5	20.00	100%	60%	40%
Overflow	2025-02-01	Y	5	16.00	100%	40%	20%
Pacific Northwest	2025-02-01	Y	2	15.00	100%	50%	0%
Southeast	2025-02-01	Y	4	15.00	100%	50%	0%
UK	2025-02-01	Y	10	12.00	100%	20%	0%
Upper Mid-Atlantic	2025-02-01	Y	7	15.71	100%	29%	29%
Upstate NY	2025-02-01	Y	3	13.33	100%	33%	0%

Data


Brandeis A	Harvard B	10	0	0	10
Brown A	Brandeis B	10	10	10	30
MIT A	Dartmouth A	10	10	10	30
Harvard A	UMass Boston	10	0	10	20
Northwestern A	Notre Dame B	10	10	10	30
Northwestern B	Notre Dame C	10	0	0	10
Georgia Tech C	Georgia Tech B	10	0	10	20
Alabama A	Vanderbilt A	10	0	0	10
Columbia B	Penn B	10	0	10	20
Cornell B	NYU B	10	10	10	30
Duke	Liberty B	10	0	0	10
South Carolina	Liberty C	10	0	0	10
UNC B	Virginia Tech A	10	0	10	20
Virginia A	UNC C	10	0	0	10
Liberty A	UNC D	10	0	0	10
William & Mary	Wake Forest	10	0	0	10
Chicago A	Illinois A	10	10	0	20
Missouri	Chicago B	10	0	10	20
Iowa State	Minnesota B	10	0	0	10
Winona State	Wisconsin A	10	0	0	10
Wisconsin B	Carleton	10	0	0	10
BU	Tufts A	10	0	0	10
Georgetown A	Notre Dame A	10	0	0	10
Stanford B	Georgetown B	10	0	10	20
Iowa	Purdue	10	0	0	10
Alberta	UW A	10	0	0	10
UBC	UW B	10	0	10	20
Georgia Tech D	Georgia Tech A	10	0	10	20
Louisville A	Bruin A	10	0	0	10
Haverford A	Rutgers A	10	0	0	10
George Washington B	John Jay College	10	0	0	10
Maryland A	Maryland B	10	0	0	10
NYU A	Haverford B	10	10	0	20
Yale A	Columbia C	10	0	0	10
Binghamton A	ESF A	10	0	10	20
Cornell D	Cornell C	10	0	0	10
RIT A	RIT B	10	0	0	10
Florida B	UCF C	10	0	0	10
Florida State A	UCF B	10	0	0	10
Florida A	Valencia A	10	0	10	20
Carnegie Mellon B	Kenyon	10	0	10	20
Carnegie Mellon A	Case Western A	10	0	0	10
Michigan D	Michigan B	10	0	0	10
Michigan C	Michigan A	10	0	0	10
Michigan State	Ohio State A	10	0	0	10
Ohio State B	Case Western B	10	0	0	10
Bristol	Oxford A	10	0	0	10
Manchester	Cambridge A	10	0	0	10
Cambridge B	Southampton A	10	0	0	10
Cambridge C	Southampton B	10	0	10	20
Cambridge D	Warwick B	10	0	10	20
Warwick A	Cambridge E	10	0	0	10
Durham	NYU C	10	0	0	10
Oxford C	Imperial B	10	0	0	10
Imperial A	Oxford B	10	0	0	10
LSE	Sheffield	10	0	0	10