【摘要】 以广义Arrhenius方程对不同氧的原子个数百分比[N(O)]和不同氮的原子个数百分比[N(N)]的Ta间隙固溶体的内耗数据进行曲线拟合,并对结果进行了讨论。预设不同的T0代替TC,得到标准差SD最小值时的自发有序温度TC、指数前因子τ0和表观激活自由能ΔG;对低弛豫元浓度的情况,由T0-ΔG数据(T0是TC附近的温度)线性拟合的截距得到激活焓ΔH,由此计算熵的变化ΔS和参数τ’0。结果显示:①自发有序温度TC与N(O)及N(N)基本上成正比的关系,显示随着N(O)或N(N)的增加,氧原子之间或氮原子之间的耦合增加,使自发有序温度TC上升;②随着N(O)或N(N)的增加,组态熵的贡献TCΔS增大,表观激活自由能ΔG下降;③参数τ’0基本不随N(O)变化,这一结果与"不同含氧量具有同一个激活焓ΔH"这一条件是自洽的,说明了在讨论的N(O)范围弛豫元是相同的,是耦合的单个弛豫元;④N(N)小于1.0%时,弛豫元是耦合的单个弛豫元;N(N)较大时,弛豫元发生变化,可能出现弱耦合的弛豫元对等,使ΔS增大。更多还原

【Abstract】 In this paper,for the internal friction data of tantalum with oxygen or nitrogen,curve fitting was made by using generalized Arrhenius relation,and the results were discussed.To obtain a self-induced ordering temperature TC,curve fitting was made with TC replaced with T0 in generalized Arrhenius relation.Self-induced ordering temperature TC,pre-exponential τ0 and apparent activation free energy ΔG were calculated basing on the criteria of the minimum of the standard difference(SD) of curve fitting.For the situation with low concentration of relaxation unit,ΔH is the interception of plot of T0-ΔG,where T0 is nearby the TC.Then entropy change ΔS and factor τ′0 can be calculated.The resultes are those as following:(1) TC is proportionate to the concentration of oxygen or nitrogen.This indicate that the the increase of oxygen or nitrogen in tantalum makes the coupling between oxygen or nitrogen increases,then makes TC increase.(2)With the increase of oxygen or nitrogen in tantalum,TCΔS,which is the contribution of combination entropy,increases,then makes the apparent activation free energy ΔG decrease.(3) Factor τ′0 is almost a constant for tantalum with oxygen.The result is self-consistent with the condition that there is a same activation enthalpy ΔH in it.These indicate that in the concentration range of oxygen in this paper,the relaxation unit is the same individual coupling unit.(4) For the situation of nitrogen concentration less than 1.0%,the relaxation unit is the same individual coupling unit.The relaxation unit changes when the concentration of nitrogen increases more.There may be some relaxation unit pairs with weak coupling in it,which make ΔS increase.更多还原