人工时效处理对2D70铝合金组织和性能的影响

时效处理摘要

人工时效处理对2D70铝合金组织和性能的

影响

摘要：2D70铝合金属于Al-Cu-Mg-Fe-Ni系铝合金，是可热处理强化的耐热铝合金，具有塑性高、耐热性好以及良好的铸造性能等特点。在冷和热状态下均具有高的塑性，其半成品齐全，主要有预拉伸厚板、板材、型材、管材、自由锻件和模锻件等，该合金能制造各种形状、尺寸不同的飞机零件。2D70铝合金的强化机制是固溶及沉淀强化，合金元素Cu和Mg有强化作用。2D70铝合金在150℃可长时间工作，在175℃以下时，合金的性能和组织变化都不明显。其热加工工艺复杂，在不同的工艺条件下，2D70铝合金可获得不同的组织和性能。本综合试验将2D70铝合金在510℃下进行固溶处理后，在经过不同温度（100~200℃）和不同保温时间（10~25t）的人工时效处理后，通过对2D70铝合金不同硬度和金相组织的分析，研究时效对2D70铝合金组织和性能的影响。 关键词：2D70 时效 组织 性能

Artificial aging treatment on Microstructure and properties of 2D70 aluminum alloy effect Abstract: Aluminum alloy 2D70 belongs to Al-Cu-Mg-Fe-Ni series aluminum alloy, is strengthened by heat treatment heat resistant aluminum alloy, with high plasticity, good heat resistance and good casting properties. In the cold and hot state have high plasticity, the semi-finished product range, mainly the prestretching plates, plates, profiles, pipe, forgings and forging pieces, the alloy can manufacture various shapes, sizes and aircraft parts. The strengthening mechanism of 2D70 aluminum alloy solid solution and precipitation strengthening, the alloying element Cu and Mg have aggrandizement effect. 2D70 aluminum alloy at a temperature of 150 DEG C can work for a long time, in 175 DEG C, alloy performance and organizational change is not obvious. The heat treatment technology is sophisticated, under different conditions, 2D70 aluminum alloy can be obtained with different microstructures and properties. The comprehensive test of 2D70 aluminum alloy in 510 DEG C. after solid solution treatment, after different temperature ( 100 ~ 200 ) and different holding time ( 10 ~ 25t ) artificial aging treatment, through to the 2D70 aluminum alloy with different hardness and metallographic structure analysis, to study the effect of aging on microstructure and properties of 2D70 aluminum alloy . Keywords：2D70 prescription microstructure