铜添加对Fe-Cr-Ni-Al-(Cu) 模型合金中析出物的影响。
The influence of Cu addition on precipitation in Fe-Cr-Ni-Al-(Cu) model alloys.
作者信息
Höring S, Wanderka N, Banhart J
机构信息
Helmholtz Centre Berlin for Materials and Energy, Glienicker Str. 100, SF3, 14109 Berlin, Germany.
出版信息
Ultramicroscopy. 2009 Apr;109(5):574-9. doi: 10.1016/j.ultramic.2008.11.006. Epub 2008 Nov 21.
Precipitation in Fe-Cr-Ni-Al-(Cu) model alloys was investigated after ageing for 0.25, 3, 10 and 100h at 798K. Characterization of nanoscale precipitates was performed using three-dimensional atom probe microscopy and transmission electron microscopy. The precipitates are found to be enriched in Ni and Al (Cu) and depleted in Fe and Cr. After 0.25h of ageing the number density of precipitates is approximately 8x10(24)m((-3)), their volume fraction is about 15.5% and they are near-spherical with an average diameter of about 2-3nm. During further ageing the precipitates in the both alloys grow, but the coarsening behaviour is different for both alloys. The precipitates of the Cu-free alloy grow much faster compared with the Cu-containing alloy and their density decreases. Precipitates in Cu-free alloy change to plate shaped even after 10h of ageing, whereas those of Cu-containing alloy remain spherical up to 10h of ageing. The influence of Cu addition on precipitation in these model alloys is discussed with respect to the different coarsening mechanisms.
研究了Fe-Cr-Ni-Al-(Cu) 模型合金在798K下时效0.25、3、10和100小时后的析出情况。使用三维原子探针显微镜和透射电子显微镜对纳米级析出物进行了表征。发现析出物富含Ni和Al (Cu)，贫Fe和Cr。时效0.25小时后，析出物的数密度约为8×10(24)m((-3))，其体积分数约为15.5%，且近似球形，平均直径约为2-3nm。在进一步时效过程中，两种合金中的析出物均会长大，但两种合金的粗化行为不同。与含Cu合金相比，无Cu合金的析出物生长速度更快，且其密度降低。无Cu合金中的析出物即使在时效10小时后也会转变为板状，而含Cu合金中的析出物在时效10小时前仍保持球形。针对不同的粗化机制，讨论了添加Cu对这些模型合金中析出的影响。
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