Crack surface morphology and grain misorientation in fatigued aluminium alloy AA7050 samples after interrupted ageing and retrogression-reageing treatments

被引：2

作者：

Carvalho, Andre L. M. ^{[1
]}

Martins, Juliana P. ^{[2
]}

Salvati, Enrico ^{[3
]}

Sui, Tan ^{[3
]}

Korsunsky, Alexander M. ^{[3
]}

机构：

[1] Univ Estadual Ponta Grossa, Dept Mat Engn, 4748 Gen Carlos Cavalcanti Ave, BR-84030900 Ponta Grossa, Parana, Brazil

[2] Univ Tecnol Fed Parana, Dept Chem Engn, Monteiro Lobato Ave, BR-84016210 Ponta Grossa, Parana, Brazil

[3] Univ Oxford, Dept Engn Sci, MBLEM, Parks Rd, Oxford OX1 3PJ, England

来源：

21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21) | 2016年 / 2卷

关键词：

Fatigue fracture surface; EBSD; Miso entation; T6I4-65 and RRA conditions; MG-CU ALLOY; MICROSTRUCTURE; SUBDIVISION; BEHAVIOR; GROWTH; PLATE;

D O I：

10.1016/j.prostr.2016.06.459

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

We present the investigation of fatigue crack surface morphology and crystallographic grain orientation in samples of aluminium alloy AA7050 that had been subjected to interrupted ageing (T6I4-65) and retrogression-reageing (RRA) heat treatments. Both T6I4-65 and RRA ageing treatments generate bimodal (particle size) microstmctural features. A single tensile overload was applied and its influence on the crystallographic grain orientation was evaluated using electron backscatter diffraction (EBSD). The results reveal that T6I4-65 and RRA heat treatments contribute to the increased occurrence of planar slip features in the form of small and large flat facets, respectively. T6I4-65 condition leads to a greater degree of lattice misorientation in the vicinity of fatigue crack tip than the RRA condition which is likely to be the evidence of increased plastic deformation due to the overload. Copyright (C) 2016 The Authors. Published by Elsevier B.V.

引用

页码：3697 / 3704

页数：8