Effects of Yb and Zr microalloying additions on the microstructure and mechanical properties of dilute Al-Sc alloys
Effects of Yb and Zr microalloying additions on the microstructure and mechanical properties of dilute Al-Sc alloys
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DOI：
10.1016/j.actamat.2011.09.019
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发表时间：
2011-12-01
期刊：
影响因子：
9.4
通讯作者：
Seidman, David N.
中科院分区：
文献类型：
--
作者：
van Dalen, Marsha E.;Gyger, Thomas;Seidman, David N.
已知当在稀二元Al-Sc合金中分别微合金化时，Zr和Yb分配到在时效期间产生的Al 3Sc沉淀物。Zr的加入延缓了Al-Sc-Zr三元合金的沉淀粗化，从而提高了合金的抗粗化能力。Yb的加入提高了Al-Sc-Yb三元合金的抗位错攀移能力，从而改善了合金的抗蠕变性能。显微硬度，蠕变，和原子探针断层扫描测量的组合提供的证据表明，Zr和Yb的这些效果的添加是累积在四元稀Al-Sc-Yb-Zr合金：Yb增加其蠕变阻力在300摄氏度相比，三元Al-Sc-Zr合金和Zr提高其粗化阻力在300摄氏度相比，三元Al-Sc-Yb合金。此外，在350和375 ℃下观察到优异的抗粗化性。(C)2011 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
It is known that Zr and Yb partition to the Al3Sc precipitates created during aging when microalloyed separately in dilute binary Al-Sc alloys. Addition of Zr delays precipitate coarsening, thereby improving the coarsening resistance of the ternary Al-Sc-Zr alloys. Addition of Yb increases the resistance against dislocation climb, thereby improving the creep resistances of the ternary Al-Sc-Yb alloys. A combination of microhardness, creep, and atom probe tomography measurements provide evidence that these effects of Zr and Yb additions are cumulative in quaternary dilute Al-Sc-Yb-Zr alloys: Yb increases their creep resistance at 300 degrees C compared with ternary Al-Sc-Zr alloys and Zr improves their coarsening resistance at 300 degrees C compared with ternary Al-Sc-Yb alloys. Additionally, excellent coarsening resistance is observed at 350 and 375 degrees C. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.