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Effect of rapid cold stamping on fracture behavior of long strip S′phase in Al−Cu−Mg alloy

Transactions of Nonferrous Metals Society of China 2020年第10期30卷 2590-2598页

作者： Cai-he FAN Ling OU Ze-yi HU Shu WANG Jun-hong WANG College of Metallurgy and Material Engineering Hunan University of TechnologyZhuzhou 412007China Anhui Jianye Science and Technology Co. Ltd.Huaibei 235000China 208 Research Institute of China Ordnance Industries Beijing 102202China

High-angle annular dark-field scanning transmission electron microscopy and selected area electron diffraction techniques were used to study the mechanism that underlies the influence of rapid cold-stamping deformation on the fracture behavior of the elongated nanoprecipitated phase in extruded Al−Cu−Mg *** show that the interface between the long strip-shaped S′phase and the aluminum matrix in the extruded Al−Cu−Mg alloy is flat and breaks during rapid cold-stamping *** breaking mechanisms are distortion and brittle failure,redissolution,and *** breakage of the long strip S′phase increases the contact surface between the S′phase and the aluminum matrix and improves the interfacial distortion *** effect accounts for the higher free energy of the S′phase than that of the matrix and creates conditions for the redissolution of solute atoms back into the aluminum *** brittle S′phase produces a resolved step during rapid cold-stamping *** step further accelerates the diffusion of solute atoms and promotes the redissolution of the S′***,the S′phase necks and separates,and the long strip-shaped S′phase in the extruded Al−Cu−Mg alloy is broken into a short and thin S′phase.

关键词： Al−Cu−Mg alloy rapid cold stamping nanoprecipitate fracture behavior breaking mechanism

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Atomic-scale characterization of multiple precipitating species in a precipitation-hardened martensitic stainless steel

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Journal of Iron and Steel Research International 2022年第2期29卷 207-214页

作者： Zhen-bao Liu Zhe Yang Jian-xiong Liang Zhi-yong Yang Guang-min Sheng Division of Special Steels Central Iron and Steel Research Institute(CISRI)Beijing100081China School of Material Science and Engineering Chongqing UniversityChongqing400044China

Multiple precipitating species in a 2.2 GPa grade precipitation-hardened martensitic stainless steel with balanced ductility were characterized at atomic scale by atom probe *** results indicated that the clustering of solute atoms was promoted with progressive aging treatments.(Cr,Mo)-rich carbide(M_(2)C)precipitated at the linear dislocations in the as-aged *** segregation of Cr,Mo,and C at phase boundaries favored the precipitation of carbide and caused the formation of Cr-lean *** decomposition of martensitic matrix during aging led to the substantial precipitation of fine Cr-rich(α′Cr)*** with the first aging treated samples,a synergistic enhancement of both strength and ductility of the secondary aging treated(SAT)samples was primarily ascribed to the enhanced precipitation of Cr-rich ***,Ni-rich filmy reversed austenite precipitated at the lath boundary,which was beneficial to the ductility of SAT samples.

关键词： Aging treatment nanoprecipitate Atom probe Spinodal decomposition Precipitation-hardened martensitic stainless steel

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