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首页> 外文期刊>Journal of Materials Engineering and Performance >Superplastic Forming Characteristics of Fine-Grained 5083 Aluminum
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Superplastic Forming Characteristics of Fine-Grained 5083 Aluminum

机译：细晶粒5083铝的超塑性成形特性

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摘要

Superplastic forming characteristics of a fine-grained 5083 aluminum sheet have been investigated by means of gas-pressure forming of a rectangular pan. This part geometry lends itself to a simple representation in terms of nearly one-dimensional sheet stretching and permits reasonably rigorous control of strain rate throughout the forming cycle. This study followed a study of the uniaxial tensile properties carried out on this alloy. A two-stage forming cycle, which comprised a short, rapid prestraining stage followed by a stage of slower rate of superplastic straining, was used because the uniaxial tensile work showed enhancement of superplastic response of this alloy under this condition. The study examined the effect of process parameters such as initial gas pressurization rate, level of hydrostatic pressure, and lubricants on the thinning characteristics of the sheet, especially along the die entry radii. The gas pressure/time cycle was suitably modified to avoid premature sheet failure due to excessive sheet thinning or cavitation. Cavitation under the biaxial forming condition and the effect of hydrostatic pressure on cavitation suppression were evaluated. A defect-free pan with sharp corners was formed.
机译：细粒5083铝板的超塑性成形特性已经通过矩形锅的气压成形进行了研究。该零件的几何形状使其易于以近似一维的片材拉伸来表示，并允许在整个成型周期中合理严格地控制应变率。这项研究是在对该合金进行单轴拉伸性能研究之后进行的。由于在该条件下单轴拉伸功显示出该合金的超塑性响应增强，因此使用了一个包括两个阶段的成型循环，该阶段包括一个短而快速的预应变阶段，然后是一个较低的超塑应变速率阶段。这项研究检查了工艺参数（例如初始气体增压率，静水压力水平和润滑剂）对薄板特性的影响，特别是沿模头入口半径的影响。适当调整气压/时间周期，以避免由于纸张过度变薄或气蚀而导致纸张过早失效。评价了双轴成形条件下的空化以及静水压力对空化抑制的影响。形成了具有尖角的无缺陷的锅。

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