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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy
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Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy

机译：时效对块状，冷轧和室温轧制Al 7075合金的组织和力学性能的影响

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摘要

The effect of ageing on mechanical properties and microstructural characteristics of a precipitation hard-enable Al 7075 alloy subjected to rolling at liquid nitrogen temperature and room temperature are has been investigated in the present work employing hardness measurements, tensile test, XRD, DSC, and TEM. The solution-treated bulk Al 7075 alloy was subjected to cryorolling and room temperature rolling to refine grain structures and subsequently ageing treatment to simultaneously improve the strength and ductility. The solution treatment combined with cryorolling up to a true rolling strain of 2.3 followed by low temperature ageing at 100 °C for 45 h has been found to be the optimum processing condition to obtain fine grained microstructure with improved tensile strength (642 MPa) and good tensile ductility (9.5%) in the Al 7075 alloy. The combined effect of suppression of dynamic recovery, partial grain refinement, partial recovery, solid solution strengthening, dislocation hardening, and precipitation hardening are responsible for the significant improvement strength-ductility combination in the cryorolled Al 7075 alloy subjected to peak ageing treatment. The cryorolled and room temperature rolled Al 7075 alloy, upon subjecting to peak ageing treatment, have shown higher strength and ductiiity in the former than the latter. It is due to presence of high density of nanosized precipitates in the peak aged cryorolled sample.
机译：在目前的工作中，已经通过硬度测量，拉伸试验，XRD，DSC和TEM研究了时效对在液氮温度和室温下轧制的可析出的可固化Al 7075合金的力学性能和显微组织特性的影响。 。将固溶处理后的块状Al 7075合金进行冷轧和室温轧制，以细化晶粒结构，然后进行时效处理，以同时提高强度和延展性。已发现固溶处理与冷冻轧制相结合，直至达到2.3的真实轧制应变，然后在100°C下进行低温时效45 h，这是获得具有改进的抗拉强度（642 MPa）且良好的细晶粒组织的最佳加工条件。 Al 7075合金的拉伸延展性（9.5％）。抑制动态回复，局部晶粒细化，局部回复，固溶强化，位错硬化和沉淀硬化的综合作用，是对经过峰值时效处理的低温轧制Al 7075合金的强度-延展性组合的显着改善。经过峰值时效处理的低温轧制和室温轧制的Al 7075合金在强度和延展性上均优于后者。这是由于在峰值时效低温冷冻样品中存在高密度的纳米级沉淀物。

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