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LD5铝合金具有比较高的强度,良好的范性,加工性等优良性能,常用作大型和形状复杂的锻件、模锻件。LD5铝合金常在固溶、人工时效状态下应用。目前常采用505～525℃固溶、155℃时效的热处理制度。但在生产实践中,按照上述工艺固溶处理的LD5制件,在金相组织中经常有黑团出现。例如,图1为某一LD5模锻件经515℃固溶热处理后,在心部发现的黑团,这些黑团的本质是什么?是否是过烧产物?本文从生产出发,目的是探索该合金中黑团的出现条件、形态特征、出现原因并对某些性能作初步探索,以期对黑团和LD5的过烧有较深刻的了解。
LD5 aluminum alloy with high strength, good performance, workability and other excellent performance, commonly used for large and complex shape forgings, forgings. LD5 aluminum alloy often in solution, artificial state of aging applications. Currently used at 505 ~ 525 ℃ solution, 155 ℃ aging heat treatment system. However, in practice, the LD5 parts solution-treated according to the above process often have black clusters in the microstructure. For example, Figure 1 shows the black clusters found in the heart of a certain LD5 forgings after solution heat treatment at 515 ° C. What is the nature of these black clusters and is it an over-burning product? The appearance conditions, morphological characteristics, reasons for the occurrence of black groups and preliminary exploration of some properties were conducted with a view to understanding the overheating of black groups and LD5.