Microstructures and mechanical properties of (AlCoCrFeMn)100 − xCux high-entropy alloys

Qin, Guoliang; Zhang, Yufeng; Chen, Ruirun; Zheng, Hongxing; Wang, Liang; Ding, Hongsheng; Guo, Jifeng; Fu, Hengzhi

doi:10.1080/02670836.2019.1629541

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…In contrast, the microstructure of HEAs in some studies (Gwalani et al, 2017) has been relatively fine and uniform, and the ductility and tensile properties of HEAs in these studies have increased with increasing Cu content. Moreover, in other studies (Qin et al, 2019;Yu et al, 2020), the addition of Cu has led to the phase evolution of HEAs, and the mechanical properties of HEAs have been diverse owing to the different phase compositions. Cu has had different modes of effects on HEAs in such studies, so different conclusions have been drawn.…”

Section: Tensile Propertiesmentioning

confidence: 99%

“…For example, a pure Cu phase in interdendritic regions was reported in the Co-Cr-Cu-Fe-Ni system (Verma et al, 2019), and a Cu-rich phase was found in interdendritic regions (Wu et al, 2018). The addition of Cu has also revealed different mechanical properties in different studies (Qin et al, 2019;Yu et al, 2020). Yu et al (2020) posited that uncontrollable Cu-segregation during the casting process leads to ambiguous phase constitution, which induces conflicting conclusions.…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and Mechanical Properties of As Cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux High-Entropy Alloys

Li¹,

Dong²,

Wang³

et al. 2021

Front. Mater.

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This study focused on the role of Cu in the microstructure characteristics and tensile properties of novel L12-strengthened multicomponent high-entropy alloys (HEAs). A series of as-cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux (x = 0.5, 2.5, 5.0) high-entropy alloys (HEAs) were prepared. The microstructures and mechanical properties of HEAs were investigated using X-ray diffraction, a scanning electron microscope, a transmission electron microscope, and atom probe tomography. The XRD patterns of HEAs confirmed that all HEAs consisted of the FCC phase and the L12 phase. As Cu content increased, the dendritic was gradually coarsened. The spherical L12 size decreased, and number density increased in the interdendritic regions (ID). The L12 mainly contained Ni, Ti, Al, and Cu. The acicular L12 size increased and was continuously distributed in the dendritic regions (DR) as the Cu content increased gradually. The ultimate strength and elongation decreased from 1,002 MPa, 20.0% to 906 MPa, 13.1%, respectively. The segregation rates of Ti, Cu, and Al increased in the DR and ID. The L12 nano-precipitates in the DR become denser and finer, while the L12 islets in the ID region increase and elongate. Large lattice distortion caused by Cu addition weakens the strength of the L12-FCC phase boundary, leading to the premature fracture of the three HEAs, which were the main reasons for the decreases in strength and ductility as Cu content increased.

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Section: Tensile Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructures and Mechanical Properties of As Cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux High-Entropy Alloys

Li¹,

Dong²,

Wang³

et al. 2021

Front. Mater.

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“…The addition of Cu to AlCoCrFeNi HEA has been shown to enhance the Cu-rich phases in the BCC matrix which results from the positive mixing enthalpy of Cu with other elements that is separated across the matrix region [12,20,21]. Various elements such as Al, Ti, Ni, Cu, and Sn have been tried to improve the HEA matrix hardening through the solid solution and dispersion strengthening mechanisms [22][23][24][25][26]. Joseph et al compared the wear resistance of AlCoCr-FeNi HEA, AISI 304, and Inconel 718 at temperatures > 900 °C.…”

Section: Introductionmentioning

confidence: 99%

Oxidative and abrasive wear of multiphase AlSi_0.75TiMnFeCu_x (X = 0, 0.25, 0.5) high entropy alloy under non-lubricating reciprocating motion

et al. 2023

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In this study, dry sliding wear of AlSi 0.75 TiMnFeCu x (x = 0, 0.25, 0.5) high-entropy alloy (HEA) produced through mechanical alloying (MA) and spark plasma sintering (SPS) was studied. The microstructure and phase evolution were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The wear behaviour of HEAs was assessed by reciprocating wear monitor under a dry air atmosphere. The findings demonstrated that AlSi 0.75 TiMnFeCu x HEAs were multiphase body-centred cubic (BCC/B2) solid solution structured with complex µ-, L 21 , and Laves. It was discovered that the microhardness and wear behaviour of AlSi 0.75 TiMnFeCu x were comparable to AlSi 0.75 TiMnFe HEA after the addition of Cu up to 0.25 molar ratio. The maximum hardness of the AlCu 0-0.5 FeMnTiSi 0.75 HEAs reached around 1021-1035 HV. The tribology results show that an oxidative wear in AlSi 0.75 TiMnFe while the mixed adhesive-abrasive wear mechanism was prominent in the AlSi 0.75 TiMnFeCu 0.25-0.5 HEAs.

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“…The choice of elements for HEAs' design is essential when taking the specific applications and economical alloy into consideration [13,14]. A variety of alloys focusing on the influence of different elements on HEAs, such as Al [15], Ni [16], Cu [17], Ti [18], and Sn [19], have been widely published.…”

Section: Introductionmentioning

confidence: 99%

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

et al. 2021

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To improve the AlCoCrFeNi high entropy alloys’ (HEAs’) toughness, it was coated with different amounts of Cu then fabricated by the powder metallurgy technique. Mechanical alloying of equiatomic AlCoCrFeNi HEAs for 25 h preceded the coating process. The established powder samples were sintered at different temperatures in a vacuum furnace. The HEAs samples sintered at 950˚C exhibit the highest relative density. The AlCoCrFeNi HEAs model sample was not successfully produced by the applied method due to the low melting point of aluminum. The Al element’s problem disappeared due to encapsulating it with a copper layer during the coating process. Because the atomic radius of the copper metal (0.1278 nm) is less than the atomic radius of the aluminum metal (0.1431 nm) and nearly equal to the rest of the other elements (Co, Cr, Fe, and Ni), the crystal size powder and fabricated samples decreased by increasing the content of the Cu wt%. On the other hand, the lattice strain increased. The microstructure revealed that the complete diffusion between the different elements to form high entropy alloy material was not achieved. A dramatic decrease in the produced samples’ hardness was observed where it decreased from 403 HV at 5 wt% Cu to 191 HV at 20 wt% Cu. On the contrary, the compressive strength increased from 400.034 MPa at 5 wt% Cu to 599.527 MPa at 15 wt% Cu with a 49.86% increment. This increment in the compressive strength may be due to precipitating the copper metal on the particles’ surface in the nano-size, reducing the dislocations’ motion, increasing the stiffness of produced materials. The formability and toughness of the fabricated materials improved by increasing the copper’s content. The thermal expansion has increased gradually by increasing the Cu wt%.

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Microstructures and mechanical properties of (AlCoCrFeMn)_{100 − x}Cu_x high-entropy alloys

Cited by 8 publications

References 36 publications

Microstructures and Mechanical Properties of As Cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux High-Entropy Alloys

Microstructures and Mechanical Properties of As Cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux High-Entropy Alloys

Oxidative and abrasive wear of multiphase AlSi_0.75TiMnFeCu_x (X = 0, 0.25, 0.5) high entropy alloy under non-lubricating reciprocating motion

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

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Microstructures and mechanical properties of (AlCoCrFeMn)100 − xCux high-entropy alloys

Cited by 8 publications

References 36 publications

Microstructures and Mechanical Properties of As Cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux High-Entropy Alloys

Microstructures and Mechanical Properties of As Cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux High-Entropy Alloys

Oxidative and abrasive wear of multiphase AlSi0.75TiMnFeCux (X = 0, 0.25, 0.5) high entropy alloy under non-lubricating reciprocating motion

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

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Microstructures and mechanical properties of (AlCoCrFeMn)_{100 − x}Cu_x high-entropy alloys

Oxidative and abrasive wear of multiphase AlSi_0.75TiMnFeCu_x (X = 0, 0.25, 0.5) high entropy alloy under non-lubricating reciprocating motion