Effect of Pre-tension Deformation on Microstructure and Properties of2219 Aluminum Alloy
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摘要: 对退火态2219铝合金板进行预拉伸变形，然后进行固溶与时效处理，研究了预拉伸变形量（0~5.0%）对铝合金组织及拉伸性能的影响，探讨了预拉伸变形后升温过程中晶粒的长大行为。结果表明：当预拉伸变形量不大于3.5%时，经固溶处理后合金的平均晶粒尺寸基本不变，约为0.1 mm，当预拉伸变形量达到5.0%时，晶粒明显变大，平均晶粒尺寸为1.66 mm；预拉变形量小于3.5%，在2219铝合金瓜瓣结构多道次拉形中道次变形量的制定不需考虑粗晶的影响，而预拉伸变形量大于3.5%时，则需考虑粗晶的影响；随着预拉伸变形量的增加，经固溶时效处理后合金的屈服强度和抗拉强度均先增大后减小，预拉伸变形量为3.0%时达到最大，分别为320，434 MPa；经过变形量为5.0%的预拉伸后，在加热温度低于525 ℃时，合金中晶粒长大现象不明显，而当温度高于525 ℃后，晶粒瞬时迅速长大。Abstract: The annealed 2219 aluminum alloy plate was pre-tension deformed and then was treated by solid solution and aging. The effect of pre-tension deformation (0-5.0%) on microstructure and tensile properties of the aluminum alloy was studied. The grain growth behavior after pre-tension during heating was discussed. The results show that when the pre-tension deformation was not larger than 3.5%, the average grain size of the alloy after solid solution varied little, which was about 0.1 mm; when the pre-tension deformation was 5.0%, the grain size increased obviously and the average value was 1.66 mm. When the pre-tension deformation was smaller than 3.5%, the influence of coarse grain was not taken into account during the formulation of pass limit deformation in the multi-pass drawing of 2219 aluminum alloy melon structure. When the pre-tension deformation was larger than 3.5%, the influence of coarse grain should be taken into account. The yield strength and tensile strength of the alloy increased first and then decreased with increasing pre-tension deformation after solid solution and aging treatment, and reached the maximum values of 320, 434 MPa with the pre-tension deformation of 3.0%. After pre-tension with deformation of 5.0%, when the heating temperature was lower than 525 ℃, the grain growth in the alloy was not obvious; when the temperature was higher than 525 ℃, the grain grew instantly and rapidly.
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Keywords:
- pre-tension deformation /
- 2219 aluminum alloy /
- tensile property /
- grain growth
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