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Critical conditions for the occurrence of quench cracking in an Al-Zn-Mg-Cu alloy
D. K. Xu; P. A. Rometsch; L. Li; L. M. Shen; N. Birbilis
2014
Source PublicationJournal of Materials Science
ISSN0022-2461
Volume49Issue:14Pages:4687-4697
AbstractThe occurrence of quench cracking in small cuboidal samples of aluminium alloy AA7150 was determined to be related to the maximum temperature difference (a dagger T (max)) between various locations within samples during quenching. When a dagger T (max) between different locations is between 96 and 124 A degrees C, there is some risk of quench cracking under various quenching conditions. When the a dagger T (max) value is higher than 124 A degrees C, quench cracks cannot be avoided. Quench cracks preferentially occur at sample corners and edges and are preferentially propagating in the short transverse direction-long transverse direction plane. Finite element modelling results indirectly indicate that the quench cracking should occur at the very early stages of the quenching process. Microscopy reveals that the quench cracking mode is intergranular, and cracks preferentially occur at high-angle grain boundaries with an average misorientation angle of similar to 42A degrees. Moreover, quench cracks can penetrate through the whole thickness of a sample quenched from 495 into 20 A degrees C water. Fractography reveals that no constituent particles exist in the quench fracture region, indicating that, unlike impact fracture, the occurrence of quench cracks is not dependent on the presence of coarse particles.
description.department[xu, d. k.] chinese acad sci, inst met res, environm corros ctr, shenyang 110016, peoples r china. [rometsch, p. a. ; birbilis, n.] monash univ, arc ctr excellence design light met, dept mat engn, melbourne, vic 3800, australia. [li, l. ; shen, l. m.] univ sydney, sch civil engn, sydney, nsw 2006, australia. ; rometsch, pa (reprint author), monash univ, arc ctr excellence design light met, dept mat engn, melbourne, vic 3800, australia. ; dkxu@imr.ac.cn ; paul.rometsch@monash.edu ; lili1626@uni.sydney.edu.au ; luming.shen@sydney.edu.au ; nick.birbilis@monash.edu
KeywordGrain-boundary Segregation 7050 Aluminum-alloy Mechanical-properties Fracture-toughness 7055-aluminum-alloy Microstructure Precipitation Sensitivity
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/72943
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
D. K. Xu,P. A. Rometsch,L. Li,et al. Critical conditions for the occurrence of quench cracking in an Al-Zn-Mg-Cu alloy[J]. Journal of Materials Science,2014,49(14):4687-4697.
APA D. K. Xu,P. A. Rometsch,L. Li,L. M. Shen,&N. Birbilis.(2014).Critical conditions for the occurrence of quench cracking in an Al-Zn-Mg-Cu alloy.Journal of Materials Science,49(14),4687-4697.
MLA D. K. Xu,et al."Critical conditions for the occurrence of quench cracking in an Al-Zn-Mg-Cu alloy".Journal of Materials Science 49.14(2014):4687-4697.
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