研究了回归温度(180℃,200℃,220℃)及预时效时间(12 h,18 h,24 h)对含Ag的7055铝合金回归再时效后的强度和微观组织的影响.结果表明,由于微量Ag的添加,120℃,18 h预时效处理后180℃回归再时效的强度稳定性较高,而随着回归温度的提高,再时效强度下降较快,这种现象归因于Ag的添加提高了GP区和η′相的稳定性,使得GP区溶解温度升高,因而180℃回归时只发生GP区和η′相的缓慢粗化,而200℃和220℃回归时发生GP区的溶解并促进η′相快速粗化形成η相;实验结果显示,预时效时间对回归再时效后的强度也有较大的影响:预时效时间较长或较短时(12 h,24 h),再时效强度随回归时间的变化较大,而经18 h预时效,再时效强度稳定性较高.这种差别是由于预时效后析出相的种类和体积分数不同所致.
参考文献
| [1] | Cina B .Reducing the Susceptibility of Alloy, Particular Aluminum Alloys to Stress Corrosion Cracking[P].US:3856584,1974. |
| [2] | Rajan K;Wallace W;Beddoes J C .Microstructural Study of a High-Strength Stress-Corrosion Resistant 7075 Aluminum Alloy[J].Journal of Materials Science,1982,17:2817. |
| [3] | Nguyen Cong Danh;Krishna Rajan;Wallace W .A TEM Study of Microstructural Changes during Retrogression and Reaging in 7075 Aluminum[J].Metallurgical and Materials Transactions,1983,14:1843. |
| [4] | Park J K;Ardell A J .Effect of Retrogression and Reaging Treatments on the Microstructure of Al 7075-T651[J].Metallurgical and Materials Transactions,1984,15:1531. |
| [5] | Danh Nguyen;Krishna Rajan;Wallace W .Discussion of Effect of Retrogression and Reaging Treatments on the Microstructure ofAl-7075-T651[J].Materials Science and Engineering,1985,16:2068. |
| [6] | Tadakazu Ohnishi;Yoshiaki Ibaraki;Taichiro Ito .Improve ment of Fracture Toughness in 7475 Aluminum Alloy by the RRA(Retrogression and Re-Aging) Process[J].Materials Transactions,1989,30(08):601. |
| [7] | Park J K .Influence of Retrogression and Reaging Treatments on the Strength and Stress Corrosion Resistance of Aluminum Alloy 7075-T6[J].Materials Science and Engineering,1988,103:223. |
| [8] | 孟昭富;郑勇;龙厚文 .Hardness Changes in Al-Zn-Mg Alloys during Retrog-ression and Re-Aging[J].金属学报,1997,33(05):479. |
| [9] | 郑子樵,李红英,莫志民.一种7055型铝合金的RRA处理[J].中国有色金属学报,2001(05):771-776. |
| [10] | Yunqing Li.Microstructure and Strain Fatigue Dislocation Structure of 7075-RRA Aluminum Alloy[J].稀有金属(英文版),2001(01):52-57. |
| [11] | Loffler H;Kovace I;Lendvai J .Decomposiotion Processes in Al-Zn-Mg Alloys[J].Journal of Materials Science,1992,27(07):4772. |
| [12] | Knano M;Araki I;Cui Q .Precipitation Behavior of 7000 Alloys during Retrogression and Reaging Treatment[J].Materials Science and Technology,1994,10(07):599. |
| [13] | Viets J T;Sargant K R;Polmear I J .The Influence of Small Additions of Silver on the Ageing Aluminium Alloys: Further Observations on Al-Zn-Mg Alloys[J].Journal of the Institute of Metals,1964,92:327. |
| [14] | 华明建;李春志;王鸿渐 .Effect of Microstructures on the Yield Strength and Scr of Aluminium Alloy[J].金属学报,1988,24(01):41. |
| [15] | 宋仁国;张宝金;曾梅光 .Investigation of Stress Corrosion Susceptibility for 7175 Aluminium Alloy Double Peak Aged[J].金属热处理,1996,17(02):51. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%