The contact-reactive brazing of Al_(0.3)CoCrFeNi high-entropy alloys with a Nb interlayer was researched.The effects of Nb thickness and brazing temperature on the interfacial microstructure and mechanical properties ...The contact-reactive brazing of Al_(0.3)CoCrFeNi high-entropy alloys with a Nb interlayer was researched.The effects of Nb thickness and brazing temperature on the interfacial microstructure and mechanical properties of Al_(0.3)CoCrFeNi joints were investigated.The results show that with Nb thickness increasing from 10 to 100μm,the average width of Al_(0.3)CoCrFeNi joints is increased from 127 to 492μm and the erosion volume of Al_(0.3)CoCrFeNi base metals(BMs)by face-centered cubic-Nb eutectic liquid is enlarged accordingly.With increasing brazing temperature from 1280 to 1360℃,the intergranular penetration of eutectic liquid into Al_(0.3)CoCrFeNi BMs becomes more severe and lamellar Laves phase is broken-up and spherized.The shear strength of joint is increased gradually from 374 to 486 MPa and then decreased to 475 MPa.The maximum shear strength value of 486 MPa is obtained when brazing at 1340℃ for 10 min,reaching about 78% of the shear strength of Al_(0.3)CoCrFeNi BMs.Besides,the brazing mechanism was analyzed in details.展开更多
基金the Outstanding Youth Innovation Team in Universities of Shandong Province(2023KJ114)National Natural Science Foundation of China(Grant No.52305344)Natural Science Foundation of Shandong Province,China(Grant No.ZR2022QE073).
文摘The contact-reactive brazing of Al_(0.3)CoCrFeNi high-entropy alloys with a Nb interlayer was researched.The effects of Nb thickness and brazing temperature on the interfacial microstructure and mechanical properties of Al_(0.3)CoCrFeNi joints were investigated.The results show that with Nb thickness increasing from 10 to 100μm,the average width of Al_(0.3)CoCrFeNi joints is increased from 127 to 492μm and the erosion volume of Al_(0.3)CoCrFeNi base metals(BMs)by face-centered cubic-Nb eutectic liquid is enlarged accordingly.With increasing brazing temperature from 1280 to 1360℃,the intergranular penetration of eutectic liquid into Al_(0.3)CoCrFeNi BMs becomes more severe and lamellar Laves phase is broken-up and spherized.The shear strength of joint is increased gradually from 374 to 486 MPa and then decreased to 475 MPa.The maximum shear strength value of 486 MPa is obtained when brazing at 1340℃ for 10 min,reaching about 78% of the shear strength of Al_(0.3)CoCrFeNi BMs.Besides,the brazing mechanism was analyzed in details.
