Degraded creep resistance induced by static precipitation strengthening in high-pressure die casting Mg-Al-Sm alloy

Qiang Yang; Shuhui  Lv; Bo Deng; Norbert Hort; Yuanding Huang; Wei Sun; Xin Qiu

doi:10.1016/j.jmst.2023.08.035

Degraded creep resistance induced by static precipitation strengthening in high-pressure die casting Mg-Al-Sm alloy

Research output: Journal contributions › Journal articles › Research

Standard

Degraded creep resistance induced by static precipitation strengthening in high-pressure die casting Mg-Al-Sm alloy. / Yang, Qiang; Lv, Shuhui ; Deng, Bo et al.
In: Journal of Materials Science and Technology, Vol. 178, 2024, p. 48-58.

Research output: Journal contributions › Journal articles › Research

Bibtex

@article{b0c510c264b3402e99b1a53a3cf4ae04,

title = "Degraded creep resistance induced by static precipitation strengthening in high-pressure die casting Mg-Al-Sm alloy",

abstract = "Relationship between precipitation strengthening and creep resistance improvement has been an important topic for the widespread applications of magnesium alloys. Generally, static precipitation strengthening through thermal stable precipitates would generate satisfactory creep resistance. However, an opposite example is presented in this work and we propose that the size of precipitates plays a crucial role in controlling the operative creep mechanisms. In addition, the precipitate components along with their crystal structures in the crept Mg–4Al–3Sm–0.4Mn samples with/without pre-aging were thoroughly studied using Cs aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Previous aging generates a large density of fine precipitates (< ∼5 nm) homogeneously distributing in Mg matrix and exhibiting satisfactory strengthening effect. However, the number density of precipitate strings consisting of several or even dozens of relatively coarse precipitates (∼10 nm) was significantly decreased at the same time. As revealed in this work, the relatively coarse particles in Mg matrix are much more efficient than the fine precipitates in promoting dislocation climb. Therefore, the rate-controlling mechanisms are transferred from dislocation climb to dislocation slip after previous aging, thus leading to degradation of creep resistance. Moreover, there are mainly five types of precipitates/clusters, namely β´´-(Al, Mg) 3Sm, Al 5Sm 3, ordered Al–Sm cluster, ordered Al–Mn cluster and ordered/unordered AlMnSm clusters. The crystal structures of the former two precipitates were discussed and the formation mechanisms of the precipitates/clusters were revealed.",

keywords = "Magnesium alloy, Transmission electron microscopy, Precipitation, Creep resistance, Segregation, Engineering",

author = "Qiang Yang and Shuhui Lv and Bo Deng and Norbert Hort and Yuanding Huang and Wei Sun and Xin Qiu",

note = "{\textcopyright} 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. Funding Information: This work is financially supported by the Chinese Academy of Sciences Youth Innovation Promotion Association (No. 2023234 ), the Scientific and Technological Developing Scheme of Jilin Province (No. 20220402012GH ), the National Natural Science Foundation of China (No. U21A20323 ), the Capital Construction Fund within the Budget of Jilin Province (No. 2023C044-2 ), and the Major science and technology projects of Jilin Province and Changchun City (No. 20220301026GX ), the Special high-tech industrialization project of science and technology cooperation between Jilin Province and Chinese Academy of Sciences (No. 2023SYHZ0036 ). Publisher Copyright: {\textcopyright} 2023",

year = "2024",

doi = "10.1016/j.jmst.2023.08.035",

language = "English",

volume = "178",

pages = "48--58",

journal = "Journal of Materials Science and Technology",

issn = "1005-0302",

publisher = "Chinese Society of Metals",

}

RIS

TY - JOUR

T1 - Degraded creep resistance induced by static precipitation strengthening in high-pressure die casting Mg-Al-Sm alloy

AU - Yang, Qiang

AU - Lv, Shuhui

AU - Deng, Bo

AU - Hort, Norbert

AU - Huang, Yuanding

AU - Sun, Wei

AU - Qiu, Xin

N1 - © 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. Funding Information: This work is financially supported by the Chinese Academy of Sciences Youth Innovation Promotion Association (No. 2023234 ), the Scientific and Technological Developing Scheme of Jilin Province (No. 20220402012GH ), the National Natural Science Foundation of China (No. U21A20323 ), the Capital Construction Fund within the Budget of Jilin Province (No. 2023C044-2 ), and the Major science and technology projects of Jilin Province and Changchun City (No. 20220301026GX ), the Special high-tech industrialization project of science and technology cooperation between Jilin Province and Chinese Academy of Sciences (No. 2023SYHZ0036 ). Publisher Copyright: © 2023

PY - 2024

Y1 - 2024

N2 - Relationship between precipitation strengthening and creep resistance improvement has been an important topic for the widespread applications of magnesium alloys. Generally, static precipitation strengthening through thermal stable precipitates would generate satisfactory creep resistance. However, an opposite example is presented in this work and we propose that the size of precipitates plays a crucial role in controlling the operative creep mechanisms. In addition, the precipitate components along with their crystal structures in the crept Mg–4Al–3Sm–0.4Mn samples with/without pre-aging were thoroughly studied using Cs aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Previous aging generates a large density of fine precipitates (< ∼5 nm) homogeneously distributing in Mg matrix and exhibiting satisfactory strengthening effect. However, the number density of precipitate strings consisting of several or even dozens of relatively coarse precipitates (∼10 nm) was significantly decreased at the same time. As revealed in this work, the relatively coarse particles in Mg matrix are much more efficient than the fine precipitates in promoting dislocation climb. Therefore, the rate-controlling mechanisms are transferred from dislocation climb to dislocation slip after previous aging, thus leading to degradation of creep resistance. Moreover, there are mainly five types of precipitates/clusters, namely β´´-(Al, Mg) 3Sm, Al 5Sm 3, ordered Al–Sm cluster, ordered Al–Mn cluster and ordered/unordered AlMnSm clusters. The crystal structures of the former two precipitates were discussed and the formation mechanisms of the precipitates/clusters were revealed.

AB - Relationship between precipitation strengthening and creep resistance improvement has been an important topic for the widespread applications of magnesium alloys. Generally, static precipitation strengthening through thermal stable precipitates would generate satisfactory creep resistance. However, an opposite example is presented in this work and we propose that the size of precipitates plays a crucial role in controlling the operative creep mechanisms. In addition, the precipitate components along with their crystal structures in the crept Mg–4Al–3Sm–0.4Mn samples with/without pre-aging were thoroughly studied using Cs aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Previous aging generates a large density of fine precipitates (< ∼5 nm) homogeneously distributing in Mg matrix and exhibiting satisfactory strengthening effect. However, the number density of precipitate strings consisting of several or even dozens of relatively coarse precipitates (∼10 nm) was significantly decreased at the same time. As revealed in this work, the relatively coarse particles in Mg matrix are much more efficient than the fine precipitates in promoting dislocation climb. Therefore, the rate-controlling mechanisms are transferred from dislocation climb to dislocation slip after previous aging, thus leading to degradation of creep resistance. Moreover, there are mainly five types of precipitates/clusters, namely β´´-(Al, Mg) 3Sm, Al 5Sm 3, ordered Al–Sm cluster, ordered Al–Mn cluster and ordered/unordered AlMnSm clusters. The crystal structures of the former two precipitates were discussed and the formation mechanisms of the precipitates/clusters were revealed.

KW - Magnesium alloy

KW - Transmission electron microscopy

KW - Precipitation

KW - Creep resistance

KW - Segregation

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85176452658&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/1ab1fa2d-e6e5-3090-b6cf-8ad64df1088a/

U2 - 10.1016/j.jmst.2023.08.035

DO - 10.1016/j.jmst.2023.08.035

M3 - Journal articles

VL - 178

SP - 48

EP - 58

JO - Journal of Materials Science and Technology

JF - Journal of Materials Science and Technology

SN - 1005-0302

ER -

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