采用固相真空扩散连接方法, 在873-913 K保温40-240 min条件下对轧制厚度分别为 20和60 um的Mo和Al箔进行扩散连接. 发现Mo-Al固-固界面反应初生相在Mo箔内部形核进而“破壳”生长的形貌演变模式, 成分分析表明该初生相为Al8Mo3. 初生相“破壳”后,Mo-Al界面上由Mo至Al的产物分布依次是Al8Mo3, Al5Mo和Al12Mo;在913 K保温240 min后, Al8Mo3与Al5Mo间出现Al4Mo相. 界面反应的动力学分析表明, 873-913 K条件下, Mo-Al界面反应初生相孕育期为 52-34.5 min; Al原子在Mo-Al界面新生相内和Mo箔内的扩散指前因子D01和D02分别为4.61 10-2和2.05 10-2 cm2/min, 扩散激活能G Al-1和G Al-2分别为0.98和1.48 eV.
Mo and Al rolled foils, of which thickness was 20 and 60 m respectively, were diffusion bonded at 873-913 K for 40-240 min. Primary phase of Mo-Al interfacial reaction was Al8Mo3, which nucleated in Mo foils and grew up with breaking the covering Mo layer. With diffusion bonding time increasing, Al8Mo3, Al5Mo and Al12Mo layers presented between Mo and Al, after bonding at 913K for 240 min, Al4Mo appeared between Al8Mo3 and Al5Mo. Kinetic analysis indicated that the incubation period of primary phase decreased from 52 to 34.5min when bonding temperature increased from 873 to 913 K, the pre-exponential factor and diffusion activation energy for an atom of Al in the new phases produced by Mo-Al reaction are 4.6110-2cm2/min and 0.98 eV respectively, correspondingly, those for an atom of Al in Mo foils are 2.0510-2cm2/min and 1.48 eV.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%