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

对于具有超高强度的金属玻璃合金（MGA）和纳米晶合金（NCA），人们希望在超高强度的同时还具有高韧性。在过冷液体粘度大于108 Pa·s，纳米准晶在过冷液体中析出时，MGA表现出约0.3%的塑性应变的加工硬化和约0.7%的塑性应变的加工软化，并伴有明显的锯齿状组织，而不降低抗拉强度。NCA表明，在Ni 14-18原子%的组成中，通过控制试样的表面粗糙度，在总应变为3-5%的条件下，试样的塑性应变约为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.