冲击热处理AW-7075-T6板材的成形过程

来源期刊:中国有色金属学报(英文版)2017年第10期

论文作者:M. KUMAR

文章页码:2156 - 2162

关键词:冲击热处理成形;AW-7075-T6板材;成形性能;析出动力学

Key words:shock heat treatment forming; AW-7075-T6 sheet; formability; precipitation kinetics

摘    要:研究AW-7075-T6板材在200~480 °C进行冲击热处理的成形行为。采用室温拉伸和深拉拔试验表征冲击热处理后样品的可成形性;采用差示扫描量热法(DSC)分析AW-7075板材冲击热处理前后的相沉积状态。结果表明,从300 °C起,随着冲击热处理温度的升高,板材的成形性开始提高;由η′析出物溶解导致的应变硬化以及剩余析出物的粗化有助于板材室温成形性能的提高;沉淀物的再析出和粗化是冲击热处理试样强度提高的主要原因。

Abstract: The forming behaviour of AW-7075-T6 sheet was studied across a range of shock heat treatment (SHT) temperatures of 200-480 °C. After SHT, formability of the samples was investigated by tension and deep drawing tests at room temperature. Differential scanning calorimetry (DSC) was used to study the precipitation states of the AW-7075 sheet in the as-received and shock heat treated conditions. Formability was started to improve with increasing shock heat treatment temperature from 300 °C onwards. Strain hardening resulted from the dissolution of η′ precipitates and the coarsening of remaining precipitates were found to contribute to the increase in formability at room temperature. Re-precipitation and coarsening of the precipitates were responsible for the post-paint baking strength of SHT samples.

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