The optimized descriptions of the phase diagram and thermodynamic properties for Ce-Al system have been obtained from experimental thermodynamic and phase diagram data by means of the computer program THERMO-CALC bas...The optimized descriptions of the phase diagram and thermodynamic properties for Ce-Al system have been obtained from experimental thermodynamic and phase diagram data by means of the computer program THERMO-CALC based on the least squares method, using models for the Gibbs energy of individual phases. The system contains five intermetallic compounds. The calculated standard enthalpies of Ce_3Al, CeAl, CeAl_2, CeAl_3 and Ce_3Al_ 11 are -26.7, -48.9, -48.4, -44.0 and -41.7 kJ/mol, respectively. A consistent set of thermodynamic parameters was derived. The optimized and experimental data are in good agreement.展开更多
To obtain lightweight multicomponent magnesium alloys with high tensile strength,ductility,and stiffness,two extruded Mg_(92−5x)Al_(1.5+3x)Zn_(3)Cu_(3.5+x)Ce_(x)(x=0.5 and 1,labeled as C0.5 and C1)alloys were designed...To obtain lightweight multicomponent magnesium alloys with high tensile strength,ductility,and stiffness,two extruded Mg_(92−5x)Al_(1.5+3x)Zn_(3)Cu_(3.5+x)Ce_(x)(x=0.5 and 1,labeled as C0.5 and C1)alloys were designed.The results reveal that the ultimate tensile strength,yield strength(YS),and fracture strain of the C0.5 alloy are simultaneously improved compared to those of the C1 alloy,with values of 346 MPa,312 MPa,and 11.7%,respectively.This enhancement is primarily attributed to the refinement of numerous secondary phases(micron scale Al_(3)CuCe,micron scale MgZnCu,and nanoscale MgZnCu phases).The calculation of YS shows that the Orowan strengthening and coefficient of thermal expansion mismatch strengthening are the main strengthening mechanisms,and the contribution values of both to the YS are 28 and 70 MPa for C0.5 alloy.In addition,the C0.5 alloy has a greater plasticity than the C1 alloy because the<c+a>slip system is initiated.展开更多
文摘The optimized descriptions of the phase diagram and thermodynamic properties for Ce-Al system have been obtained from experimental thermodynamic and phase diagram data by means of the computer program THERMO-CALC based on the least squares method, using models for the Gibbs energy of individual phases. The system contains five intermetallic compounds. The calculated standard enthalpies of Ce_3Al, CeAl, CeAl_2, CeAl_3 and Ce_3Al_ 11 are -26.7, -48.9, -48.4, -44.0 and -41.7 kJ/mol, respectively. A consistent set of thermodynamic parameters was derived. The optimized and experimental data are in good agreement.
基金financially supported by the National Key Research and Development Program of China(No.2022YFB3709300)the Guangdong Major Project of Basic and Applied Basic Research,China(No.2020B0301030006)the Chongqing Special Project of Science and Technology Innovation,China(No.cstc2021yszx-jcyjX0007)。
文摘To obtain lightweight multicomponent magnesium alloys with high tensile strength,ductility,and stiffness,two extruded Mg_(92−5x)Al_(1.5+3x)Zn_(3)Cu_(3.5+x)Ce_(x)(x=0.5 and 1,labeled as C0.5 and C1)alloys were designed.The results reveal that the ultimate tensile strength,yield strength(YS),and fracture strain of the C0.5 alloy are simultaneously improved compared to those of the C1 alloy,with values of 346 MPa,312 MPa,and 11.7%,respectively.This enhancement is primarily attributed to the refinement of numerous secondary phases(micron scale Al_(3)CuCe,micron scale MgZnCu,and nanoscale MgZnCu phases).The calculation of YS shows that the Orowan strengthening and coefficient of thermal expansion mismatch strengthening are the main strengthening mechanisms,and the contribution values of both to the YS are 28 and 70 MPa for C0.5 alloy.In addition,the C0.5 alloy has a greater plasticity than the C1 alloy because the<c+a>slip system is initiated.
