首页|Effect of Ga on the microstructure and properties of NiCoV alloy at different annealing temperatures

Effect of Ga on the microstructure and properties of NiCoV alloy at different annealing temperatures

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To obtain a high-entropy alloy characterized by high strength and plasticity,(NiCoV)100-xGax(x=0,5,7)was successfully prepared,cold-rolled,and heat-treated.The microstructure was analyzed to correlate Ga content with the performance of the system.The addition of Ga can produce alloying effects,including solid solution strengthening effect,second phase precipitation strengthening effect,and layer misalignment energy reduction effect.The experimental results show adding Ga elements can enrich Ni,Co,V,and Ga above the grain bound-aries,causing the alloy to produce annealed twins inside.The alloy is strengthened mainly by precipitation,and the formation of the precipitation phase effectively enhances the strength of the alloy.The low stacking fault energy promotes the toughening of NiCoV but makes the plasticity of the alloy decrease.Still,the formation of annealed twins effectively increases the plasticity,which makes the alloy harder but does not reduce the plasticity too much.By comparing the experimental properties,(NiCoV)93Ga7 showed the best mechanical properties at the annealing temperature of 900 C,yield strength,tensile strength and elongation of 906 MPa,1321 MPa and 21.36%,respectively.

High entropy alloyAnnealing treatmentMechanical propertiesPrecipitation strengtheningTwin strengthening

Jin Li、Peng Wang、Lvxing Chen、Meifeng He、Jun Cheng

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School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai,200093,China

Northwest Institute for Nonferrous Metal Research,Shaanxi Key Laboratory of Biomedical Metal Materials,Xi'an,710016,China

National Natural Science Foundation,ChinaNational Natural Science Foundation,ChinaKey Research and Development Program of Shanxi

52371070522712492023-YBGY-488

2024

10.1016/j.pnsc.2024.04.007

自然科学进展·国际材料(英文)
国家自然科学基金委员会

自然科学进展·国际材料(英文)

影响因子：0.25
ISSN：1002-0071
年,卷(期)：2024.34(2)
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