采用累积叠轧(Accumulative roll bonding,ARB)制备AX10/ZK60层状异构复合材料,研究累积叠轧道次对复合材料微观组织与力学性能的影响。结果表明:随着ARB道次的增加,抗拉强度和屈服强度逐渐上升,断裂总先上升后下降,但未发生明显下降。...采用累积叠轧(Accumulative roll bonding,ARB)制备AX10/ZK60层状异构复合材料,研究累积叠轧道次对复合材料微观组织与力学性能的影响。结果表明:随着ARB道次的增加,抗拉强度和屈服强度逐渐上升,断裂总先上升后下降,但未发生明显下降。ARB第6道次的力学性能达到最佳,抗拉强度、屈服强度和断裂总分别为274 MPa、240 MPa和13.9%。材料强度的提高归因于细晶强化和第二相强化的协同作用,断裂总的提高是层间结构界面产生背应力引起的。硬度整体呈现升高趋势,这是因为ARB过程中产生的大量位错增强了材料硬度,但第5、6道次的硬度出现波动,这是由动态再结晶效应及大量亚结构的形成导致的。展开更多
To resolve the strength-ductility trade-off problem for high-strength Mg alloys,we prepared a high performance Mg-8Gd-3Y-0.5 Zr(wt%)alloy with yield strength of 371 MPa,ultimate tensile strength of 419MPa and elongati...To resolve the strength-ductility trade-off problem for high-strength Mg alloys,we prepared a high performance Mg-8Gd-3Y-0.5 Zr(wt%)alloy with yield strength of 371 MPa,ultimate tensile strength of 419MPa and elongation of 15.8%.The processing route involves extrusion,pre-deformation and aging,which leads to a bimodal structure and nano-precipitates.Back-stress originated from the deformationincompatibility in the bimodal-structure alloy can improve ductility.In addition,dislocation density in coarse grains increased during the pre-deformation strain of 2%,and the dislocations in coarse grains can promote the formation of chain-like nano-precipitates during aging treatment.The chain-like nanoprecipitates can act as barriers for dislocations slip and the existing mobile dislocations enable good ductility.展开更多
文摘采用累积叠轧(Accumulative roll bonding,ARB)制备AX10/ZK60层状异构复合材料,研究累积叠轧道次对复合材料微观组织与力学性能的影响。结果表明:随着ARB道次的增加,抗拉强度和屈服强度逐渐上升,断裂总先上升后下降,但未发生明显下降。ARB第6道次的力学性能达到最佳,抗拉强度、屈服强度和断裂总分别为274 MPa、240 MPa和13.9%。材料强度的提高归因于细晶强化和第二相强化的协同作用,断裂总的提高是层间结构界面产生背应力引起的。硬度整体呈现升高趋势,这是因为ARB过程中产生的大量位错增强了材料硬度,但第5、6道次的硬度出现波动,这是由动态再结晶效应及大量亚结构的形成导致的。
基金This work was supported financially by the National Key Research and Development Plan(No.2016YFB0301103)the National Natural Science Foundation of China(Nos.51771109 and 51631006)the Shanghai Rising-Star Program(No.16QB1402800).
文摘To resolve the strength-ductility trade-off problem for high-strength Mg alloys,we prepared a high performance Mg-8Gd-3Y-0.5 Zr(wt%)alloy with yield strength of 371 MPa,ultimate tensile strength of 419MPa and elongation of 15.8%.The processing route involves extrusion,pre-deformation and aging,which leads to a bimodal structure and nano-precipitates.Back-stress originated from the deformationincompatibility in the bimodal-structure alloy can improve ductility.In addition,dislocation density in coarse grains increased during the pre-deformation strain of 2%,and the dislocations in coarse grains can promote the formation of chain-like nano-precipitates during aging treatment.The chain-like nanoprecipitates can act as barriers for dislocations slip and the existing mobile dislocations enable good ductility.
