The modeling effects of constituents and dispersoids on the tensile ductility of aluminum alloy were studied.The results show that the tensile ductility decreases with the increase of the volume fraction and size of c...The modeling effects of constituents and dispersoids on the tensile ductility of aluminum alloy were studied.The results show that the tensile ductility decreases with the increase of the volume fraction and size of constituents.Thus,purification can improve the tensile ductility by decreasing the volume fraction of constituents(normally compositions of Fe and Si)and the first-class microcracks.The model also indicates that the tensile ductility decreases with the increase in the volume fraction of dispersoids.Decreasing the volume fraction of dispersoids along the grain boundaries by proper heat-treatment and improving the cohesion strength between dispersoids and matrix can also improve the tensile ductility by decreasing the volume fraction of the second-class microcracks.展开更多
The effect of Yb addition on the strength and fracture toughness of Al-Zn-Mg-Cu-Zr aluminum alloy was investigated by measuring tensile properties and fracture toughness.The surface morphology was observed by optical ...The effect of Yb addition on the strength and fracture toughness of Al-Zn-Mg-Cu-Zr aluminum alloy was investigated by measuring tensile properties and fracture toughness.The surface morphology was observed by optical microscopy,scanning electron microscopy and transmission electron microscopy.The results show that Yb addition can produce fine coherent Yb contained dispersoids.Those dispersoids trend to inhibit Al matrix recrystallization and retain the recovery deformed microstructure.Compared with Al-Zn-Mg-Cu-Zr alloy,Yb contained alloy demonstrates mechanical property improvements from 710 MPa to 747 MPa for ultimate strength,from 684 MPa to 725 MPa for yield strength,from 21 MPa.m1/2 to 29 MPa.m1/2 for fracture toughness with T6 treatment.展开更多
基金Project (2005CB623704) supported by National Key Fundamental Research and Development Program of China
文摘The modeling effects of constituents and dispersoids on the tensile ductility of aluminum alloy were studied.The results show that the tensile ductility decreases with the increase of the volume fraction and size of constituents.Thus,purification can improve the tensile ductility by decreasing the volume fraction of constituents(normally compositions of Fe and Si)and the first-class microcracks.The model also indicates that the tensile ductility decreases with the increase in the volume fraction of dispersoids.Decreasing the volume fraction of dispersoids along the grain boundaries by proper heat-treatment and improving the cohesion strength between dispersoids and matrix can also improve the tensile ductility by decreasing the volume fraction of the second-class microcracks.
基金Project(2005CB623704)supported by the National Basic Research Program of ChinaProject(50721003)supported by the Creative Research Group of National Natural Science Foundation of China
文摘The effect of Yb addition on the strength and fracture toughness of Al-Zn-Mg-Cu-Zr aluminum alloy was investigated by measuring tensile properties and fracture toughness.The surface morphology was observed by optical microscopy,scanning electron microscopy and transmission electron microscopy.The results show that Yb addition can produce fine coherent Yb contained dispersoids.Those dispersoids trend to inhibit Al matrix recrystallization and retain the recovery deformed microstructure.Compared with Al-Zn-Mg-Cu-Zr alloy,Yb contained alloy demonstrates mechanical property improvements from 710 MPa to 747 MPa for ultimate strength,from 684 MPa to 725 MPa for yield strength,from 21 MPa.m1/2 to 29 MPa.m1/2 for fracture toughness with T6 treatment.
