Synthesis of Ultra-High Strength and High Toughness Next-Generation Metallic Structure Materials with Nano Structure and Research of the Deformation and Strengthening Mechanisms

在具有超高强度的金属玻璃合金（MGA）和纳米晶合金（NCA）上，追求高塑性和超高强度。并对其变形和强化机理进行了研究。当过冷液粘度大于108pa sec，纳米准晶在过冷液中析出时，MGA表现为加工硬化，塑性应变约为0.3%，随后加工软化，并伴有明显的锯齿，塑性应变约为0.7%，但拉伸强度不降低。NCA分析表明，Ni 14- 18at的抗拉强度与Ni 14- 18at的抗拉强度基本一致。通过cu衬底粗糙度控制试样表面粗糙度，获得了约3 GPa的% W，总应变为3-5%，其中大塑性应变约为0.5- 3%。

On the metallic glassy alloy (MGA) and nanocrystalline alloy (NCA) which show ultra-high strength, the high ductility together with the ultra-high strength were intended. In addition, the deformation and strengthening mechanisms were investigated.The MGA, that the supercooled liquid viscosity shows more than 10 8 Pa sec and the nano-quasicrystals precipitate in the supercooled liquid, showed work hardening with about 0.3% plastic strain and successively work softening accompanied by clear serrations with about 0.7% plastic strain without decreasing the tensile strength. The NCA showed that tensile strengths in the composition of the Ni 14-18 at.% W were achieved to about 3 GPa with the total strains of 3-5% containing the large plastic strain of about 0.5-3 % by the specimen surface roughness controlled by the Cu-substrate roughness.