1.Introduction The strength-ductility trade-offdilemma has long been a per-sistent challenge in Al matrix composites(AMCs)[1,2].This is-sue primarily arises from the agglomeration of reinforcements at the grain bounda...1.Introduction The strength-ductility trade-offdilemma has long been a per-sistent challenge in Al matrix composites(AMCs)[1,2].This is-sue primarily arises from the agglomeration of reinforcements at the grain boundaries(GBs),which restricts local plastic flow dur-ing the plastic deformation and leads to stress concentration[3,4].Recently,the development of concepts aimed at achieving hetero-geneous grain has emerged as a promising approach for enhanc-ing comprehensive mechanical properties[5,6].展开更多
Al;Cu;Ti;metallic glass（AMG） reinforced Al matrix composites were consolidated by equal channel angular pressing（ECAP） process. The effects of ECAP consolidation temperature ranging from room temperature to just b...Al;Cu;Ti;metallic glass（AMG） reinforced Al matrix composites were consolidated by equal channel angular pressing（ECAP） process. The effects of ECAP consolidation temperature ranging from room temperature to just below the first crystallization temperature of metallic glass on the consolidation of composites were investigated in terms of the relative densities, structural evolutions and mechanical properties of composites. Some intermetallic compounds included Al;CuTi;, Al;Ti and Al;Cu;precipitated from metallic glass particles at consolidation temperature of 300?C. Consolidation temperature did not affect the matrix grains size of the composite. Quantitative analysis revealed that the distribution of reinforcing particles was considerably dependent on consolidation temperature. Density of the composite was increased by increasing the consolidation temperature to 250?C. The composite consolidated at250?C through ECAP process, exhibited the best combination of yield strength and ductility of 184 MPa and 48%, respectively.展开更多
High-entropy alloy(HEA),as a class of new alloy materials characterized by high stability,excellent specific strength and corrosion resistance,has attracted much attention in the field of aluminum matrix composites(AM...High-entropy alloy(HEA),as a class of new alloy materials characterized by high stability,excellent specific strength and corrosion resistance,has attracted much attention in the field of aluminum matrix composites(AMCs).To study the effect on microstructure and mechanical properties of aluminum alloys,AlCoCrFeNi HEA particles reinforced ADC12 composites were fabricated by high energy ultrasonic casting process.Subsequently,the effect of HEAs addition on the microstructure and mechanical properties of ADC12 alloys was investigated.Results show that the added HEA particles are tightly bonded to the aluminum matrix.The Al_(2)Cu phase in the matrix is refined.Meanwhile,the tensile strength and microhardness of the alloys with the addition of HEA particles are significantly improved.The yield strength and ultimate tensile strength of as-prepared composites with 12wt%HEAs are increased by 16.9%and 21.9%compared with those of the matrix,respectively.The wear rate of the composites is also decreased due to the enhancement of microhardness under applied load of 20 N.It is mainly attributed to the load transfer strengthening,dislocation proliferation and the optimization of the microstructure.展开更多
基金support by the National Natural Science Foundation of China(Grant Nos.U23A20546 and 52271010)the Chinese National Natural Science Fund for Distinguished Young Scholars(Grant No.52025015)the Natural Science Foundation of Tianjin City(No.21JCZDJC00510).
文摘1.Introduction The strength-ductility trade-offdilemma has long been a per-sistent challenge in Al matrix composites(AMCs)[1,2].This is-sue primarily arises from the agglomeration of reinforcements at the grain boundaries(GBs),which restricts local plastic flow dur-ing the plastic deformation and leads to stress concentration[3,4].Recently,the development of concepts aimed at achieving hetero-geneous grain has emerged as a promising approach for enhanc-ing comprehensive mechanical properties[5,6].
基金the support of Iran National Science Foundation(INSF)
文摘Al;Cu;Ti;metallic glass（AMG） reinforced Al matrix composites were consolidated by equal channel angular pressing（ECAP） process. The effects of ECAP consolidation temperature ranging from room temperature to just below the first crystallization temperature of metallic glass on the consolidation of composites were investigated in terms of the relative densities, structural evolutions and mechanical properties of composites. Some intermetallic compounds included Al;CuTi;, Al;Ti and Al;Cu;precipitated from metallic glass particles at consolidation temperature of 300?C. Consolidation temperature did not affect the matrix grains size of the composite. Quantitative analysis revealed that the distribution of reinforcing particles was considerably dependent on consolidation temperature. Density of the composite was increased by increasing the consolidation temperature to 250?C. The composite consolidated at250?C through ECAP process, exhibited the best combination of yield strength and ductility of 184 MPa and 48%, respectively.
基金Science and Technology Research Program of Jiangxi Provincial Department of Education(GJJ190531)。
文摘High-entropy alloy(HEA),as a class of new alloy materials characterized by high stability,excellent specific strength and corrosion resistance,has attracted much attention in the field of aluminum matrix composites(AMCs).To study the effect on microstructure and mechanical properties of aluminum alloys,AlCoCrFeNi HEA particles reinforced ADC12 composites were fabricated by high energy ultrasonic casting process.Subsequently,the effect of HEAs addition on the microstructure and mechanical properties of ADC12 alloys was investigated.Results show that the added HEA particles are tightly bonded to the aluminum matrix.The Al_(2)Cu phase in the matrix is refined.Meanwhile,the tensile strength and microhardness of the alloys with the addition of HEA particles are significantly improved.The yield strength and ultimate tensile strength of as-prepared composites with 12wt%HEAs are increased by 16.9%and 21.9%compared with those of the matrix,respectively.The wear rate of the composites is also decreased due to the enhancement of microhardness under applied load of 20 N.It is mainly attributed to the load transfer strengthening,dislocation proliferation and the optimization of the microstructure.
