Metallurgical and Materials Transactions B ( IF 2.4 ) Pub Date : 2021-03-25 , DOI: 10.1007/s11663-021-02125-6 Jun Ik Jang , Seil Lee , Youngjo Kang
To investigate the effect of Si on Al and AlN precipitation in ferritic Fe, high-temperature thermochemical equilibrium experiments were conducted on Fe-Si-Al foils and Ag-Si-Al alloys at 1373 K, 1423 K, and 1473 K. Using the activity coefficient in the infinite dilute solution and the self-interaction parameter of Si in ferritic Fe, the interaction parameter between Si and Al in solidified ferritic Fe was found to be a positive value, which corresponds to a repulsive relationship. And its temperature dependence could be also determined as follows.
$$ e_{\text{Al}}^{\text{Si}} = \frac{3025}{T} - 1.73 $$Considering the effect of Si on the activity coefficient of Al, the solubility of AlN in ferrite Fe was investigated and compared with the conventional estimation. It could be confirmed that the stable region of AlN formation becomes larger due to the repulsive relationship between Si and Al in the present research.
中文翻译：
Si和Al的相互作用及其对1373 K至1473 K下铁素体Fe中AlN析出的影响
为了研究Si对铁素体Fe中Al和AlN析出的影响，在Fe-Si-Al箔和Ag-Si-Al合金上以1373 K，1423 K和1473 K进行了高温热化学平衡实验。无限稀释溶液中的活度系数和铁素体Fe中Si的自相互作用参数，凝固的铁素体Fe中Si与Al的相互作用参数为正值，这与排斥关系相对应。并且其温度依赖性也可以如下确定。
$$ e _ {\ text {Al}} ^ {\ text {Si}} = \ frac {3025} {T}-1.73 $$考虑到Si对Al的活度系数的影响，研究了AlN在铁素体Fe中的溶解度，并与常规估计进行了比较。可以证实，由于本研究中Si和Al之间的排斥关系，AlN形成的稳定区域变大了。
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