摘要
金属间化合物Fe_3Al在氧中的常温延性比在空气中的高得多,且强度也有一定程度的增加,这证实了它在空气中的常温脆性是由环境造成的。添加适量的Cr可使合金的常温延性提高,但只有当材料表面形成氧化膜时,Cr的作用才较明显。XPS实验表明,这是由于在该氧化膜中有足够数量的保护性氧化物Al_2O_3,可以抑制或推迟Al和环境水汽的反应,使材料的本征韧性得以分充发挥。
The ductility of Fe,Al significantly increases and its ultimate strength also improves in a certain sense when the alloy is tested in oxygen This confirms that the RT embrittlement is induced by an environmental factor.The adequate addition of Cr results in an improvement in ductility measured in air Only the oxide films formed of on the surfaces of the chromium-containing specimens the effect of Cr is displayed apparently. This suggests that in the oxygenized film there exists enough protective oxide A12O3 which could restrain or retard the chemical reaction of A1 with the water vapor molecule, resulting in theabundant development of intrinsic toughness.
出处
《上海钢研》
1994年第4期1-4,共4页
Journal of Shanghai Iron and Steel Research
基金
上海市青年科学基金
关键词
金属互化物
FE3AL
铬
韧化
intermetallics ductility embrittlement environmental effect X-ray photoelectron spectroscopy
