通过室温拉伸、腐蚀试验、TEM等手段,研究人工时效前预拉伸处理对2A97铝锂合金组织和性能的影响。结果表明：在相同时效工艺下,经3%的预拉伸变形后,2A97合金的强度和耐蚀性能都有较大提高,其中抗拉强度提高了32 MPa,晶间腐蚀等级变为点蚀等级；预拉伸处理促进了时效过程中T1相在晶内的均匀弥散析出,降低了δ′相的含量,抑制了晶界平衡相的析出,从而改善了合金的强度和耐蚀性能。
The effect of pre-sretching processing before artificial aging on the microstructures and properties of 2A97 Al-Li alloy was in-vestigated by using tensile test,corrosion test and transmission electron microscope( TEM) observations. The results show that under the same aging process, the tensile strength and the corrosion property of 2A97 Al-Li alloy are greatly increased after 3% pre-sretching;the tensile strength increases 32 MPa, and intergranular corrosion level changes to pitting corrosion. The pre-sretching promotes the T1 phase precipitation and makes its distribution more dispersive and homogeneous at matrix, reducing the content of the δ′phase, while the precipitation of equilibrium phase is restrained during the aging process, consequently improving the tensile strength and the corro-sion property.
参考文献
| [1] | 袁志山;吴秀亮;陆政;谢优华;戴圣龙;刘常升.2A97铝锂合金时效行为研究[J].稀有金属材料与工程,2008(11):1898-1902. |
| [2] | K. S. KUMAR;S. A. BROWN;J. R. PICKENS.MICROSTRUCTURAL EVOLUTION DURING AGING OF AN Al-Cu-Li-Ag-Mg-Zr ALLOY[J].Acta materialia,19965(5):1899-1915. |
| [3] | S.P. RINGER;B.C. MUDDLE;I.J. POLMEAR.Effects of Cold Work on Precipitation in Al-Cu-Mg-(Ag) Cu-Li(Mg-Ag) Alloys[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,19957(7):1659-1671. |
| [4] | Csontos A.A.;Starke E.A..The Effect of Processing and Microstructure Development on the Slip and Fracture Behavior of the 2.1 Wt Pct Li AF/C-489 and 1.8 Wt Pct Li AFIC-458 Al-Li-Cu-X Alloys[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,20008(8):1965-1976. |
| [5] | 聂辉文;潘清林;聂俊红.时效处理对2124铝合金预拉伸厚板微观组织与腐蚀行为的影响[J].航空材料学报,2014(2):22-28. |
| [6] | 李劲风;郑子樵;任文达.第二相在铝合金局部腐蚀中的作用机制[J].材料导报,2005(2):81-83,90. |
| [7] | 林毅;郑子樵;韩烨;张海锋.热处理工艺对2A97铝锂合金拉伸性能和腐蚀性能的影响[J].中国有色金属学报,2012(8):2181-2186. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%