The Al-Cu wheel adopting the new Al alloy was prepared by the liquid-die forging,and the mechanical properties,composition distribution,microstructure and fracture behavior were investigated.The results showed that se...The Al-Cu wheel adopting the new Al alloy was prepared by the liquid-die forging,and the mechanical properties,composition distribution,microstructure and fracture behavior were investigated.The results showed that serious Cu segregation was found in the wheel specimen;the microstructure of the Al-Cu wheel was comprised of the casting microstructure and a small amount of the deformed microstructure;the best heat treatment and water quenching system were found to solution treated at(530±5)℃ for 4 h followed by(535±5)℃ for 24 h and aging treated at(155±5)℃ for 4 h;the fracture morphologies of the samples heated under T 6 and T 5-1 heat treatment showed flat,tough nest,and poor plastic characteristics;the fracture morphologies of the samples heated under T 4 heat treatment exhibited complete resilience,but no residual metallographic characteristic;the sample treated under T 4 protocol had the best elongation;the fracture failure was mainly due to the formation of the CuAl_(2)(θ)phases;and the fracture mechanism of the Al-Cu wheel was intergranular fracture.展开更多
The effect of die forging on the microstructure evolution and deformation behavior of metastable β-titanium alloy Ti55511 was investigated by electron backscatter diffraction.Before die forging,the alloy Ti55511 was ...The effect of die forging on the microstructure evolution and deformation behavior of metastable β-titanium alloy Ti55511 was investigated by electron backscatter diffraction.Before die forging,the alloy Ti55511 was subjected to multi-pass forging to optimize the microstructural heterogeneity(texture)which can cause mechanical behavior anisotropy of titanium alloys.Results show that after die forging,Ti55511 components exhibit different microstructures and textures in different local areas.No<100>fiber texture is found in all areas with different degrees of deformation.Dynamic recrystallization occurs in the area where large strain occurs during the early stage of die forging.Basket-weave microstructure forms in most local areas.展开更多
基金Project(2019 YFC 1511400)supported by the National Key Technologies R&D Program of China。
文摘The Al-Cu wheel adopting the new Al alloy was prepared by the liquid-die forging,and the mechanical properties,composition distribution,microstructure and fracture behavior were investigated.The results showed that serious Cu segregation was found in the wheel specimen;the microstructure of the Al-Cu wheel was comprised of the casting microstructure and a small amount of the deformed microstructure;the best heat treatment and water quenching system were found to solution treated at(530±5)℃ for 4 h followed by(535±5)℃ for 24 h and aging treated at(155±5)℃ for 4 h;the fracture morphologies of the samples heated under T 6 and T 5-1 heat treatment showed flat,tough nest,and poor plastic characteristics;the fracture morphologies of the samples heated under T 4 heat treatment exhibited complete resilience,but no residual metallographic characteristic;the sample treated under T 4 protocol had the best elongation;the fracture failure was mainly due to the formation of the CuAl_(2)(θ)phases;and the fracture mechanism of the Al-Cu wheel was intergranular fracture.
基金National Science and Technology Project of China(JPPT-135-GH-2-017)Fellowship of China Postdoctoral Science Foundation(2022M720399)。
文摘The effect of die forging on the microstructure evolution and deformation behavior of metastable β-titanium alloy Ti55511 was investigated by electron backscatter diffraction.Before die forging,the alloy Ti55511 was subjected to multi-pass forging to optimize the microstructural heterogeneity(texture)which can cause mechanical behavior anisotropy of titanium alloys.Results show that after die forging,Ti55511 components exhibit different microstructures and textures in different local areas.No<100>fiber texture is found in all areas with different degrees of deformation.Dynamic recrystallization occurs in the area where large strain occurs during the early stage of die forging.Basket-weave microstructure forms in most local areas.
