为了研究蠕变温度对Al-Cu-Mg合金晶内S'相析出过程的影响,测定125、150、175、200 ℃4种温度下合金的蠕变性能,并通过透射电子显微镜对比分析蠕变后试样夹头部位和断口附近区域的微观组织变化.结果表明:在150℃,345MPa蠕变96 h后,合金断口附近区域晶内S'相的长度和厚度比夹头部位增加了1倍.在175℃,265MPa蠕变100h和在200℃,210 MPa蠕变115 h后,合金断口附近区域晶内S'相厚度比夹头部位都有明显增加,而长度则略有下降.
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