材料期刊网

研究了含氧的几种Mo-Ti合金的内耗,观察到除了氧在Mo-Mo间隙位置扩散所引起的110℃内耗峯外,还有一个由于氧在Mo-Ti间隙位置扩散所引起的55℃内耗峯,后一过程所包含的激活能为22,600卡/克原子。 用统计方法计算了氧原子在这两种间隙位置的配分函数及位能差。 此外,还指出钛会扩大氧在钼中的溶解度,因而降低Mo-Ti合金的脆性转变温度。

Internal friction in several molybdenum-titanium alloys containing oxygen was measured. Besides the 110℃ peak associated with the diffusion of oxygen between Mo-Mo interstitial sites, another peak around 55℃ was observed which was shown to be associated with the stress-induced micro-diffusion of oxygen between Mo-Ti interstitial sites. The activation energy for the latter process was found to be 22600 cal/g-atom. The condition for the appearance of the 55℃ peak is the presence of both titanium and oxygen in molybdenum.The partition functions and the potential energy difference of oxygen atoms in the two interstitial sites were calculated by means of a standard statistical method. Furthermore, it was shown that titanium would enlarge the solubility of oxygen in molybdenum, thus lowering the ductile-brittle transition temperature of molybdenum-titanium alloys.