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首页> 外文期刊>Materials Science and Engineering >Deformation structures and strengthening mechanisms in an Al-Cu alloy subjected to extensive cold rolling
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Deformation structures and strengthening mechanisms in an Al-Cu alloy subjected to extensive cold rolling

机译：粗冷轧Al-Cu合金的变形组织和强化机理

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摘要

The deformation structures, mechanical properties and strengthening mechanisms of a 2519 aluminum alloy subjected to cold rolling up to a total reduction of 80% (ε ~ 1.61) in the supersaturated solid solution condition were studied. The formation of cell structure and a one hundred-fold increase in lattice dislocation density up to - 2.1 × 10~(15)m~(-2) after a 40% reduction leads to increase in yield stress (σ_(vs)) and ultimate tensile strength (σ_(tuts)) from 135 to 453 MPa, from 350 to 503 MPa, respectively. The formation of fully lamellar structure and further increase in lattice dislocation up to p_d - 5 × 10~(15) m~(-2) take place at an 80% reduction. As a result, σ_(ys) and σ_(uts) increase to 560 and 590 MPa, respectively. Yield stress at reductions 2 40% are significantly higher than that in an AA2519T87 alloy. Subdivision of initial grains by lamellar boundaries due to deformation banding provide high efficiency of dislocation strengthening due to the accumulation of an extremely high density of lattice dislocations in supersaturated solid solution and retention of sufficient elongation-to-failure of 9% and 5% after reductions of 40% and 80%, respectively.%Aluminum alloys; Thermomechanical processing; Hardening; Dislocations; Grain boundaries; Strengthening mechanisms
机译：研究了2519铝合金在过饱和固溶条件下冷轧至总压下率达80％（ε〜1.61）的变形组织，力学性能和强化机理。减少40％后，单元结构的形成和晶格位错密度的百倍增加至-2.1×10〜（15）m〜（-2）导致屈服应力（σ_（vs））和极限抗拉强度（σ_（tuts））从135到453 MPa，从350到503 MPa。全层状结构的形成和晶格位错的进一步增加直至p_d-5×10〜（15）m〜（-2）以减少80％的方式发生。结果，σ_（ys）和σ_（uts）分别增加到560 MPa和590 MPa。降低2 40％时的屈服应力明显高于AA2519T87合金。由于形变带而将初始晶粒细分为片状边界，由于过高固溶体中极高密度的晶格位错的积累，并且还原后保留了9％和5％的足够的断裂伸长率，因此位错强化效率高分别为40％和80％。％铝合金;热机械加工；硬化;脱位；晶界加强机制

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