Hardening and softening of FeAl during milling and annealing

被引：41

作者：

Amils, X

Nogués, J

Suriñach, S

Barò, MD

Muñoz-Morris, MA

Morris, DG ^{[1
]}

机构：

[1] CSIC, Dept Met Phys, CENIM, Madrid 28040, Spain

[2] Univ Autonoma Barcelona, Dept Fis, Bellaterra 08193, Spain

来源：

INTERMETALLICS | 2000年 / 8卷 / 07期

关键词：

iron aluminides (based on FeAl); mechanical properties at ambient temperature; order/disorder transformations; mechanical alloying and milling;

D O I：

10.1016/S0966-9795(00)00013-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Changes in hardness of Fe-40Al powders during milling and during subsequent annealing have been examined and related to the many structural changes occurring. During milling, the material becomes significantly disordered with a small domain size and many vacancies, and refines to a nano-scale grain size, while on subsequent annealing at progressively higher temperatures these structural defects are lost as the material re-orders, loses point defects and as the grains grow to large sizes. The increase in hardness during milling can be explained by the combined contributions of vacancy hardening, ordered domain/particle hardening, and by disorder hardening within the ordered regions. Softening during annealing occurs as the domain/particle hardening, disorder hardening and vacancy hardening are successively lost. Dislocation-induced work hardening and grain size hardening are believed to play only minor roles in affecting the material hardness. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：805 / 813

页数：9

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