轧制驱动ECA大应变加工及后续热处理对5052铝合金力学性能与晶体取向的影响

发布时间：2018-06-20 08:53

本文选题：等通道转角 + 热处理　；参考：《稀有金属》2015年08期

【摘要】：采用轧制驱动等通道转角(ECA)大应变技术对退火态5052铝合金进行大应变加工,并对大应变5052铝合金分别进行后续200℃×1 h,350℃×1 h,500℃×1 h的热处理,研究了大应变加工及后续热处理对5052铝合金的硬度、拉伸性能和晶体取向的影响。结果表明,轧制驱动等通道转角大应变技术可以显著提高5052铝合金的硬度与强度,尤其是屈服强度从107上升到275 MPa,硬度从HV60.7~HV115.6,提升幅度高达90%;后续200℃×1 h退火后合金发生一定程度的回复,硬度小幅下降(从HV115.6下降到HV105.8);后续350℃×1 h和500℃×1 h退火使合金的硬度与拉伸性能明显下降,材料发生明显再结晶现象,500℃×1 h退火后合金的力学性能回复到原始状态,但织构强度显著降低,晶体处于无择优取向状态。本文说明轧制驱动等通道转角大应变技术结合后续热处理可以有效调整合金晶体取向,但退火温度超过250℃后材料力学性能难以保证;对于纯铝来说,ECA加工后的后续热处理温度为250℃时,能够获得良好的力学性能和组织均匀性。
[Abstract]:Large strain processing of annealed 5052 aluminum alloy was carried out by large strain technique of rolling drive equal channel angle (ECA). The heat treatment of large strain 5052 aluminum alloy after 200 c * 1 h, 350 C 1 h, 500 C 1 h respectively, was used to study the effect of large strain processing and subsequent heat treatment on the hardness, tensile properties and crystal orientation of the 5052 aluminum alloy. The results show that the hardness and strength of the 5052 aluminum alloy can be significantly increased by the rolling driven angle large strain technique, especially the yield strength from 107 to 275 MPa, and the hardness from HV60.7~HV115.6 to 90%. After the subsequent 200 c 1 h annealing, the alloy has a certain degree of recovery, and the hardness decreases slightly (from HV115.6 to HV105.). 8), the hardness and tensile properties of the alloy decreased obviously after annealing at 350 degrees C * 1 h and 500 C 1 h, and the material had obvious recrystallization. The mechanical properties of the alloy recovered to the original state after 500 C 1 h annealing, but the texture strength decreased significantly, and the crystal was in the non preferred orientation state. This paper explained the large strain technique of rolling driven equal channel angle. The alloy crystal orientation can be effectively adjusted by subsequent heat treatment, but the mechanical properties of the material are difficult to guarantee after the annealing temperature is over 250. For pure aluminum, the following heat treatment temperature after ECA processing can obtain good mechanical properties and microstructure uniformity.
【作者单位】：江苏大学先进制造与现代装备工程研究院;
【基金】：国家自然科学基金项目(51074079)资助
【分类号】：TG339

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