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Determination of macroscopic and microscopic residual stresses in friction stir welded metal matrix composites via neutron diffraction
X. X.; Ni Zhang, D. R.; Xiao, B. L.; Andra, H.; Gan, W. M.; Hofmann, M.; Ma, Z. Y.
2015
Source PublicationActa Materialia
ISSN1359-6454
Volume87Pages:161-173
AbstractThis study presents a new method to determine both the macroscopic and microscopic (including elastic mismatch, thermal misfit and plastic misfit) residual stresses in metal matrix composite (MMC) welds via neutron diffraction. As an illustration, friction stir welded 17 vol.% SiCp/2009Al-T4 plates were investigated. It is shown that the calculation of the thermal misfit plus plastic misfit residual stresses in the metal matrix of the MMC welds is much more accurate by using the absolute unstrained lattice parameter of the SiC powder sample based on the stress equilibrium condition compared with using that of the unreinforced alloy sample. The profiles of the longitudinal (L), transverse (T) and normal (N) components of the total residual stress in the reinforcement are entirely different from those in the matrix. It was found that the profiles and total variations of the L, T and N components of the total residual stress are dominated by those of the macroscopic residual stress in the matrix, and by those of the elastic mismatch residual stress in the reinforcement, revealing a significant load transfer from the matrix to the reinforcement. The maximum total residual stress in the metal matrix of the FSW 17 vol.% SiCp/2009Al-T4 weld could reach up to similar to 69% of the yield strength of the 2009Al-T4 alloy. Increasing the rotation rate has small effects on the basic profiles of the total residual stress, apart from increasing the width of the profiles. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[zhang, x. x. ; ni, d. r. ; xiao, b. l. ; ma, z. y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [andrae, h.] fraunhofer inst ind math, d-67663 kaiserslautern, germany. [gan, w. m.] helmholtz zentrum geesthacht, german engn mat sci ctr, d-21502 geesthacht, germany. [hofmann, m.] tech univ munich, forsch neutroneqelle heinz maier leibnitz frm ii, d-85747 garching, germany. ; ma, zy (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; zyma@imr.ac.cn
KeywordResidual Stress Metal Matrix Composites Neutron Diffraction Friction Stir Welding Fatigue-crack Growth Heat-affected Zone Aluminum-alloy Mechanical-properties Al Sheets Microstructural Evolution Reinforced Composite Misfit Stresses Strain Strength
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74027
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
X. X.,Ni Zhang, D. R.,Xiao, B. L.,et al. Determination of macroscopic and microscopic residual stresses in friction stir welded metal matrix composites via neutron diffraction[J]. Acta Materialia,2015,87:161-173.
APA X. X..,Ni Zhang, D. R..,Xiao, B. L..,Andra, H..,Gan, W. M..,...&Ma, Z. Y..(2015).Determination of macroscopic and microscopic residual stresses in friction stir welded metal matrix composites via neutron diffraction.Acta Materialia,87,161-173.
MLA X. X.,et al."Determination of macroscopic and microscopic residual stresses in friction stir welded metal matrix composites via neutron diffraction".Acta Materialia 87(2015):161-173.
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