High-entropy alloys (HEAs) have been extensively investigated primarily because of their wide range of properties (mechanical, thermal, corrosion, etc.) that enable their application in countless applications. One of the most promising families is the AlxCoCrFeNi based HEA, which tends to form simple phases and exhibit simple phase evolution with temperature. In this system, the complexity of the phase evolution tends to increase with decreasing temperatures, which complicates the collection and analysis of experimental thermodynamic data. Therefore, most of the work done in this system regarding phase transitions has been at high temperatures (T > 1000 degrees C). Al0.5CoCrFeNi has promising mechanical properties due to its duplex nature. It has an FCC dendrite core (DC) region at low temperatures, which occupies about 90 vol%: the reminder is a B2/BCC mixture inter-dendritic (ID) region. Each region has a different chemical composition, which leads to different phase evolution at intermediate temperatures (400 <= T <= 900 degrees C). The phase composition and evolution were studied using high-sensitivity calorimetry followed by electron microscopy and XRD characterization. The DC region exhibits a simpler phase evolution with ordered FCC (L1(2)) nano-precipitation at 508 degrees C that transitions to B2 precipitation at 778 degrees C. The L1(2) -> B2 transition is associated with a large exothermic event caused by the release of 'symmetry-breaking' strain and significant shrinkage. The ID region exhibits a more complicated phase evolution that starts with precipitation of a Co-Cr rich HCP phase at 626 degrees C and continues with the precipitation of Cr-Fe rich sigma (sigma) phase along the boundaries between the regions at 699 degrees C, followed by the transition of the BCC precipitation into FCC at 733 degrees C. All these transitions in the ID region are associated with non-linear expansion. The experimental findings were compared with the thermodynamic evolution made using the ThermoCalc software and two thermodynamic databases. (C) 2021 Elsevier B.V. All rights reserved.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 USABeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Wang, L.
Zhang, F.
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Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China
Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Zhang, F.
Nie, Z.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Nie, Z.
Wang, L.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 USABeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Wang, L.
Wang, F.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Wang, F.
Wang, B.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Wang, B.
Zhou, S.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Zhou, S.
Xue, Y.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Xue, Y.
Cheng, B.
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Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Cheng, B.
Lou, H.
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Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Lou, H.
Chen, X.
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Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Chen, X.
Ren, Y.
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Argonne Natl Lab, Xray Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USABeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Ren, Y.
Brown, D. E.
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Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 USABeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Brown, D. E.
Prakapenka, V.
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Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60437 USABeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Prakapenka, V.
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Greenberg, E.
Zeng, Z.
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Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Zeng, Z.
Zeng, Q. S.
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Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China
Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
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Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Univ Leoben, Dept Mat Sci, Jahnstr 12, A-8700 Leoben, AustriaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Zhang, Zequn
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Fellner, Simon
Ketov, Sergey
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Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, AustriaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Ketov, Sergey
Cordill, Megan J.
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Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, AustriaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Cordill, Megan J.
Sheng, Huaping
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Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, AustriaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Sheng, Huaping
Mitterer, Christian
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Univ Leoben, Dept Mat Sci, Franz Josef Str 18, A-8700 Leoben, AustriaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Mitterer, Christian
Song, Kaikai
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Shandong Univ, Sch Mech Elect & Informat Engn, Wenhua Xilu 180, Weihai 264209, Peoples R ChinaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Song, Kaikai
Gammer, Christoph
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Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, AustriaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Gammer, Christoph
Eckert, Juergen
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Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
Univ Leoben, Dept Mat Sci, Jahnstr 12, A-8700 Leoben, AustriaAustrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
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Ben Gurion Univ Negev, Dept Mat Engn, POB 653, IL-84105 Beer Sheva, IsraelBen Gurion Univ Negev, Dept Mat Engn, POB 653, IL-84105 Beer Sheva, Israel
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Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R ChinaCent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
Wang, Bingfeng
Wang, Chu
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Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R ChinaCent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
Wang, Chu
Liu, Bin
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Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R ChinaCent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
Liu, Bin
Zhang, Xiaoyong
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