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首页> 外文期刊>Materials Science and Engineering >Effects of annealing on microstructure and mechanical properties of nano-grained Ni-based alloy produced by severe cold rolling
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Effects of annealing on microstructure and mechanical properties of nano-grained Ni-based alloy produced by severe cold rolling

机译：退火对强冷轧纳米晶Ni基合金组织和力学性能的影响

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摘要

Nano-grained (NG) Ni-based alloy with average grain size about 50 nm was produced via severe cold rolling at room temperature. Compared to the solution-treated alloy prepared for rolling, the cold-rolled (CRed) NG alloy exhibited approximately 475%, 130% and 180% increase in the average yield strength (YS), ultimate tensile strength (UTS) and microhardness, respectively. Effect of the annealing on mechanical properties and microstructure of this NG Ni-based alloy were investigated systematically. The annealed-CRed alloys possessed NG (90 nm) and ultrafine-grained structure (200 nm) after 60 min annealing at 700 and 800 ℃, respectively, suggesting high thermal stability of the nanostructure. Peak YS and UTS of 2047.5 and 2142 MPa, respectively, were obtained with appropriate annealing temperature and time. The mechanisms of variations in mechanical properties were analyzed based on phase composition and microstructure evolution of the annealed NG Ni-based alloy. Both the high thermal stability and strength are due to the formation of the γ' precipitates and slight grain growth of the NG matrix.
机译：通过在室温下进行严格的冷轧生产了平均晶粒尺寸约为50 nm的纳米晶粒（NG）Ni基合金。与准备轧制的固溶处理合金相比，冷轧（CRed）NG合金的平均屈服强度（YS），极限抗拉强度（UTS）和显微硬度分别提高了约475％，130％和180％ 。系统研究了退火对这种NG Ni基合金的力学性能和组织的影响。退火后的CRed合金在700℃和800℃退火60min后分别具有NG（90nm）和超细晶组织（200nm），表明纳米结构具有较高的热稳定性。在适当的退火温度和时间下，可获得分别为2047.5和2142 MPa的YS和UTS峰值。基于退火后的NG Ni基合金的相组成和微观组织演变，分析了力学性能变化的机理。高的热稳定性和强度都归因于γ'沉淀的形成和NG基体的细微晶粒长大。

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