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

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

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Relationship between precipitation strengthening and creep resistance improvement has been an impor-tant topic for the widespread applications of magnesium alloys.Generally,static precipitation strength-ening through thermal stable precipitates would generate satisfactory creep resistance.However,an op-posite 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 thor-oughly studied using Cs aberration-corrected high-angle annular dark-field scanning transmission elec-tron 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,namelyβ"-(Al,Mg)3Sm,Al5Sm3,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.

Magnesium alloyTransmission electron microscopyPrecipitationCreep resistanceSegregation

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

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State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China

School of Materials Science and Engineering,Changchun University of Science and Technology,Changchun 130022,China

MagIC-Magnesium Innovation Centre,Helmholtz-Zentrum Hereon,Max-Planck Strasse 1,Geesthacht 21502,Germany

Institute of Product Technology and Systems,Leuphana University Lüneburg,Universiättsalle,Lüneburg 121335,Germany

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Chinese Academy of Sciences Youth Innovation Promotion AssociationScientific and Technological Developing Scheme of Jilin ProvinceNational Natural Science Foundation of ChinaCapital Construction Fund within the Budget of Jilin ProvinceMajor science and technology projects of Jilin Province and Changchun CitySpecial hightech industrialization project of science and technology cooperation between Jilin Province and Chinese Academy

202323420220402012GHU21A203232023C044-220220301026GX2023SYHZ0036

2024

10.1016/j.jmst.2023.08.035

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.178(11)
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