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采用力学性能、硬度、电导率测试和电子显微分析技术,研究了固溶-时效处理对6082铝合金挤压棒材组织与性能的影响。结果表明,6082挤压态合金组织除固溶体基体外,还包括微米级的含Cr和Mn的短棒状相、亚微米级的Mg2Si平衡相和α-(AlMnFeSi)夹杂相;固溶过程中亚微米级的Mg2Si平衡相溶解,微米级的含Cr和Mn的短棒状相和α-(AlMnFeSi)夹杂相仍然保留下来,时效过程中过饱和固溶体分解析出主要强化相β″相。合金棒材适宜的固溶-时效制度为545℃×50 min固溶水淬,170℃×8 h时效,在此条件下,合金棒材的抗拉强度、屈服强度和伸长率分别为367 MPa、341 MPa和14.1%。
The effects of solution treatment and aging treatment on the microstructure and properties of 6082 aluminum alloy extruded bar were studied by mechanical properties, hardness, electrical conductivity and electron microscopy. The results show that in addition to the solid solution matrix, the microstructure of the 6082 alloy also includes microrods of short rod-like phases containing Cr and Mn, submicron Mg2Si phases and α- (AlMnFeSi) inclusions; Grade Mg2Si phase is dissolved, and the microrods of short rod-shaped phase and α- (AlMnFeSi) phase containing Cr and Mn are still retained. During the aging process, supersaturated solid solution decomposes to form β "phase of the main strengthening phase. The solid solution-aging system is 545 ℃ × 50 min, quenching solution, 170 ℃ × 8 h aging. Under these conditions, the tensile strength, yield strength and elongation of the alloy bar are 367 MPa, 341 MPa and 14.1%.