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纳米孪晶金属材料卢磊1,卢柯1(1.辽宁省沈阳市科学院金属研究所沈阳材料科学(联合)实验室)摘 要:材料的强化通常是在材料内部引入各种缺陷以阻碍位错运动来实现,如固溶强化,弥散强化,细晶强化和应变强化等,但这些传统的强化途径无可避免地会影响材料的塑性形变能力,导致塑性和韧性的降低.利用纳米尺度孪晶界面实现材料强化可避免上述缺点.本文对纳米孪晶强化原理和纳米孪晶金属研究进展进行了简要综述,分别讨论了纳米孪晶变形机制,纳米孪晶金属的部分力学行为(如强度,塑性,应变速率敏感性和加工硬化等)和物理性能(如导电性),以及......
austenite grains embedded with nano-scale twin bundles (of about 20% in volume) has been synthesized in a 316L stainless steel (SS). Such a 316L SS sample exhibits a tensile strength as high as 1001 MPa and an elongation-to-failure of about 23%. The much elevated strength originates from the presence of a considerable number of strengthening nano-twin bundles, while the ductility from the recrystallized......
-sheng, et al. Molecular dynamics simulation of effect of twin boundaries spacing on mechanical properties of nano-tungsten[J]. The Chinese Journal of Nonferrous Metals, 2021, 31(8): 2136-2145. DOI...: The scaling behavior between the twin thickness and the grain size[J]. Materials Today Nano, 2020, 11: 100086. [17] XU S, CHAVOSHI S Z, SU Y. Deformation mechanisms in nanotwinned tungsten nanopillars......
秋虹, 赵伟松, 隋曼龄, 李斗星. 液氮温度下动态塑性形变法制备的纳米孪晶铜结构的研究[J]. 金属学报, 2006, 42(9): 909?913.LU Qiu-hong, ZHAO Wei-song, SUI Man-ling, LI Dou-xing. Microstructures of nano-twin structured Cu produced by dynamic......
that there are twin and nano-twin boundaries on Si and CGr in the composite particles, which is favorable to the formation of β-SiC at the interface. The SAED pattern is composed of the diffraction..., in EL-ESKANDARANY et al’s trial[4], ball milling of the Si-50%C (mole fraction) powder firstly results in the formation of the twin and nanotwin boundaries on Si and C. A solid state reaction takes......
1 Introduction Recent experimental results demonstrated that electro-deposited Cu with nano-scale twins, which was called nanocrystalline twin copper, may show ultrahigh tensile strength... structures with a high density of coherent twin boundaries (TBs)[1]. Efforts were drawn in order to understand the unusual mechanical properties of Cu with nano-twins[2-4]. Some important clues were......
and rolling behaviors of nano-grained copper with embedded nano-twin bundles [J]. Acta Mater, 2008, 56: 2429-2440. [16] QIAN L H, WANG S C, ZHAO Y H, LU K. Microstrain effect on thermal properties... high resolution transmission electron microscope (HRTEM). The HRTEM foils of 3 mm in diameter were cut from the aged sample. They were ground to 60-90 μm in thickness, and then thinned by twin-jet......
of nano-grained copper with embedded nano-twin bundles [J]. Acta Materialia, 2008, 56(11): 2429-2440. [12] SARMA V S, WANG J, JIAN W W, KAUFFMANN A, CONRAD H, FREUDENBERGER J, ZHU Y T. Role of stacking... twinning would play an important role in carrying plastic strain [10], the twin boundary (TB) as a special kind of coherent boundary is also a barrier for dislocation slipping like the conventional GBs......
distribution of the boundary curvature and energy [16]. A stating structure of nanocrystalline nickel with a (111) preferred orientation and nano-twin defects is in a thermodynamic low energy state... of annealing nano-twins with low-energy, which reduces the driving force for grain growth. Consequently, the coating shows a low residual tensile stress of about 50 MPa and a high microhardness of HV 400......
alloy [J]. Materials Characterization, 2016, 118: 417-424. [18] WU Z, PARICH C M, BEI H. Nano-twin mediated plasticity in carbon-containing FeNiCoCrMn high entropy alloys [J]. Journal of Alloys..., and the average grain size was evaluated by the Nano Measurer software. To ensure the accuracy, at least 20-30 grains in each condition were picked up, and irregular grains were measured by several......
