Properties and influence of microstructure and crystal defects in Fe2VAl modified by laser surface remelting

被引：23

作者：

Gomell, Leonie ^{[1
]}

Roscher, Moritz ^{[1
]}

Bishara, Hanna ^{[1
]}

Jaegle, Eric A. ^{[1
,2
]}

Scheu, Christina ^{[1
]}

Gault, Baptiste ^{[1
,3
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[2] Univ Bundeswehr Munchen, Inst Werkstoffkunde, Werner Heisenberg Weg 39, D-85577 Neubiberg, Germany

[3] Imperial Coll London, Royal Sch Mines, Dept Mat, London, England

来源：

SCRIPTA MATERIALIA | 2021年 / 193卷

基金：

欧洲研究理事会;

关键词：

Thermoelectric materials; Atom probe tomography; Microstructure; Grain boundary defects; Laser surface remelting; THERMOELECTRIC PROPERTIES; BISMUTH TELLURIDE; ANTISITE DEFECTS; HOT-CRACKING; PERFORMANCE; BOUNDARIES;

D O I：

10.1016/j.scriptamat.2020.10.050

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Laser surface remelting can be used to manipulate the microstructure of cast materials. Here, we present a detailed analysis of Fe2VAl following laser surface remelting. Within the melt pool, elongated grains grow nearly epitaxially from the heat-affected zone. These grains are separated by low-angle grain bound-aries with 1 degrees-5 degrees misorientations. Segregation of vanadium, carbon, and nitrogen at grain boundaries and dislocations is observed using atom probe tomography. The local electrical resistivity was measured by an in-situ four-point-probe technique. A smaller increase in electrical resistivity is observed at these low angle grain boundaries compared to high-angle grain boundaries in a cast sample. This indicates that grain boundary engineering could potentially be used to manipulate thermoelectric properties. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：153 / 157

页数：5

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