采用放电等离子烧结(spark plasma sintering)法在低压和低温 (50 MPa和400-500 ℃)条件下快速烧结制备出了含准晶强化相的 块体Al90Mn9Ce1合金, 其致密度大于98%, 抗压 强度超过1000 MPa. 与普通高强度铝合金相比, 其强度约提高1倍. 结果表明, 在放电等离子烧结过程中, 采用大电流、短时、低 温的烧结条件可使快冷雾化法制备的原始合金粉末中的准晶强 化相及其它细小强化相得以保存, 而局域强放电等离子体可以分 解或破碎铝合金粉末表面的氧化膜, 使合金粉末颗粒间的结合强 度增加, 制备出的块体铝合金具有高的致密度和超高强度.
Using spark plasma sintering technique, a bulk Al90Mn9Ce1 alloy, reinforced by quasicrystal particles, has been sintered under the pressure of 50 MPa at 400 ℃. The density and the compressive strength of the as-prepared bulk alloy are above 98% and 1000 MPa, respectively. It has been found that during the spark plasma sintering process, under the condition of large current, short sintering time and lower sintering temperature, the metastable icosahedron quasicrystal phase in primary powder particles is kept. And the strong discharge plasma among particles can decompose or break the oxide film on the primary powder's surface, resulting in the increment of their combination strength. So the as-prepared bulk alloy possesses high density and ultra-high strength.
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%