【摘要】 为了解决大飞机蒙皮用7075铝合金薄板T6态性能要求。本工作采用室温拉伸试验、金相及扫描电镜研究了工业化生产的7075薄板前铸锭的均热效果,单级时效工艺对7075薄板的力学性能的影响规律。结果表明合金铸锭经均匀化处理后,主要残留含Fe相,共晶组织基本消除。铸锭经热轧、冷轧至2.5 mm,固溶后薄板的晶粒呈拉长状态,再结晶程度达到80%。单级时效结果表明:随着时效时间的延长,7075薄板L和LT向的抗拉强度、屈服强度不断增加,延伸率有所降低,选择121℃/36 h作为7075薄板T6态时效制度,此时L和LT向抗拉强度分别为531MPa和520.5 MPa,屈服强度分别为448.5 MPa和440.5 MPa,延伸率分别为15.5%和14.8%。更多还原

【Abstract】 In order to meet the performance requirements of 7075 aluminum alloy coated sheet T6 aging for large aircraft skin. In this paper,the homo-genizationeffect and the effect of single stage aging process on the mechanical properties of 7075 thin plate were studied by means of room temperature tensile test,OM and SEM. The results showed that Fe-containing phase remained and eutectic structure was basically eliminated after homogenization. After hot rolling,cold rolling to 2.5 mm and then solution treatment,the grains of the plate were elongated and the recrystallization degree reached 80%. The single-stage aging results show,that with the increase of aging time,the tensile strength and yield strength in the L and LT directions of 7075 thin plate increase continuously,while the elongation decreases. At 121 ℃/36 h,the T6 state aging system of7075 thin plate is selected. At this time,the tensile strength in the L and LT directions are 531 MPa and 520.5 MPa,respectively; the yield strength is 448.5 MPa and 440.5 MPa,and the elongation is 15.5% and 14.8%,respectively.更多还原