Mechanisms of necklace recrystallization in a BCC Fe-Al-Ta alloy with strengthening Laves phase precipitates

被引：3

作者：

Emdadi, Aliakbar ^{[1
]}

Yang, Yitong ^{[1
]}

Bolz, Sebastian ^{[2
]}

Stryzhyboroda, Oleg ^{[3
]}

Tovar, Michael ^{[4
]}

Gein, Sergej ^{[3
]}

Hecht, Ulrike ^{[3
]}

Wei, Sabine ^{[1
]}

机构：

[1] Brandenburg Univ Technol Cottbus Senftenberg, Chair Phys Met & Mat Technol, Konrad Wachsmann Allee 17, D-03046 Cottbus, Germany

[2] Brandenburg Univ Technol Cottbus Senftenberg, Chair Hybrid Mfg, Konrad Wachsmann Allee 17, D-03046 Cottbus, Germany

[3] Access V, Intze str 5, D-52072 Aachen, Germany

[4] Helmholtz Zentrum Berlin Mat & Energie GmbH, Hahn Meitner Pl 1, D-14109 Berlin, Germany

来源：

SCRIPTA MATERIALIA | 2023年 / 237卷

关键词：

Hot working; Iron aluminides; Dynamic recrystallization; Particle -stimulated nucleation (PSN); Grain boundary migration; HIGH-TEMPERATURE DEFORMATION; PARTICLE STIMULATED NUCLEATION; DYNAMIC RECRYSTALLIZATION; HOT DEFORMATION; BEHAVIOR; MICROSTRUCTURE; EVOLUTION; COLD;

D O I：

10.1016/j.scriptamat.2023.115705

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A necklace structure composed of fine grains formed by dynamic recrystallization was uncommonly observed at the pre-existing grain boundaries during the hot compression of a BCC Fe-25Al-1.5Ta alloy containing C14 - (Fe, Al)2Ta Laves phase precipitates. Two possible mechanisms for necklace formation were proposed; particlestimulated nucleation and grain boundary bulging, depending on whether the original grain boundaries are occupied by C14 particles, or they are free of them. Recrystallization was initiated preferentially around the clusters of large particles at the boundaries containing particles. In contrast, the bulging of the original grain boundaries by strain-induced boundary migration was observed as a preliminary stage for necklace formation at the particle-free boundaries. The necklace structure expanded into the deformed volume in such a way that lowangle subgrain boundaries decorating the necklace layers transformed into grains with increasing deformation strain.

引用

页数：6

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