采用光学显微及透射电子显微、维氏硬度、拉伸力学性能、电导率测试等技术,研究了试验6156铝合金的人工时效与蠕变时效强化规律与微观组织特征.结果表明,在本文试验的温度(155～175℃)-应力(0～200MPa) -时间(8～14h)范围内,采用不同制度的人工时效和蠕变时效样品的力学性能相差不大,但蠕变时效的析出相数量增多、尺寸变小,力学性能与电导率指标均呈升高趋势.蠕变时效过程中,蠕变第一阶段变形量占总变量的85％以上,增加蠕变应力对蠕变第一阶段变形量的影响十分明显.该合金蠕变时效温度与应力对强度峰值影响不明显,但显著影响蠕变变形量,适合于构件蠕变时效成形.
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