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Microstructure and tribological behavior of Mg-Gd-Zn-Zr alloy with LPSO structure 被引量:4
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作者 曹丽杰 吴玉娟 +2 位作者 彭立明 王渠东 丁文江 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第12期3785-3791,共7页
A Mg-14.28Gd-2.44Zn-0.54Zr (mass fraction, %) alloy was prepared by conventional ingot metallurgy (I/M). The microstructure differences in as-cast and solution-treated alloys were investigated. Sliding tribologica... A Mg-14.28Gd-2.44Zn-0.54Zr (mass fraction, %) alloy was prepared by conventional ingot metallurgy (I/M). The microstructure differences in as-cast and solution-treated alloys were investigated. Sliding tribological behaviors of the as-cast and solution-treated alloys were investigated under oil lubricant condition by pin-on-disc configuration. The wear loss and friction coefficients were measured at a load of 40 N and sliding speeds of 30-300 mm/s with a sliding distance of 5000 m at room temperature. The results show that the as-cast alloy is mainly composed ofα-Mg solid solution, the lamellar 14H-type long period stacking ordered (LPSO) structure within matrix, andβ-[(Mg,Zn)3Gd] phase. However, most of theβ-phase transforms to X-phase with 14H-type LPSO structure after solution heat treatment at 773 K for 35 h (T4). The solution-treated alloy presents low wear-resistance, because the hard β-phase is converted into thermally-stable, ductile and soft X-Mg12GdZn phase with LPSO structure in the alloy. 展开更多
关键词 Mg-Gd-Zn-Zr alloy long period stacking ordered (LPSO) structure MICROstructure friction wear
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Dual phases strengthening behavior of Mg-10Gd-1Er-1Zn-0.6Zr alloy 被引量:5
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作者 Lin-yue JIA Wen-bo DU +3 位作者 Zhao-hui WANG Ke LIU Shu-bo LI Zi-jian YU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第3期635-646,共12页
The microstructure evolution and strengthening mechanisms of Mg-10Gd-1Er-1Zn-0.6Zr(wt.%) alloy were focused in the view of the size parameters and volume fraction(fp) of dual phases(long period stacking ordered(LPSO) ... The microstructure evolution and strengthening mechanisms of Mg-10Gd-1Er-1Zn-0.6Zr(wt.%) alloy were focused in the view of the size parameters and volume fraction(fp) of dual phases(long period stacking ordered(LPSO) structures and β’ precipitates).Results show that two types of LPSO phases with different morphologies formed,and the morphology and size of both LPSO phases varied with the solution conditions.However,the volume fraction decreased monotonously with increasing solution temperature,which in turn raised the volume fraction of β’ phase during aging.The alloy exhibited an ultimate tensile strength of 352 MPa,a yield strength of 271 MPa,and an elongation of 3.5% after solution treatment at 500℃ for 12 h and aging at 200℃ for 114 h.In contrast to the LPSO phase,the β’ phase seems to play a more important role in enhancing the yield strength,and consequently,a decreased fLPSO/fβ’,ratio results in an increased yield strength. 展开更多
关键词 magnesium alloys heat treatment long period stacking ordered(LPSO) structures PRECIPITATE mechanical properties
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Refining 18R-LPSO phase into sub-micron range by pre-kinking design and its prominent strengthening effect on Mg_(97)Y_(2)Zn_(1)alloy 被引量:1
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作者 Chao Sun Huan Liu +7 位作者 Ziyue Xu Yuna Wu Kai Yan Jia Ju Jinghua Jiang Feng Xue Jing Bai Yunchang Xin 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第9期13-24,共12页
In this study,a composite deformation strategy of pre-kinking(equal channel angular pressing(ECAP))followed by large-ratio hot extrusion(HE)was designed to refine the 18R long period stacking ordered(LPSO)phase into s... In this study,a composite deformation strategy of pre-kinking(equal channel angular pressing(ECAP))followed by large-ratio hot extrusion(HE)was designed to refine the 18R long period stacking ordered(LPSO)phase into sub-micron range in a Mg_(97)Y_(2)Zn_(1)(at.%)alloy.After the composite processing,the mechanical properties of the alloy are significantly enhanced,superior to the majority of reported Mg_(97)Y_(2)Zn_(1) and other LPSO-containing Mg alloys.Among the composite deformed alloys,the 16P-HE alloy exhibits the best mechanical properties with tensile yield strength(TYS)of 475 MPa,ultimate tensile strength(UTS)of 526 MPa,and fracture elongation(FE)of 14.5%.Quantitative analysis of 18R phase indicates that increasing ECAP pass from 1 to 16 gradually decreases the average size of 18R phase from 5.1μm to 2.3μm.After HE,the 18R phase is further refined with a corresponding decrease in the average size in the descending order of 1P-HE(4.3μm),4P-HE(3.2μm),and 16P-HE(1.4μm)alloys.Calculation of the strengthening contributions confirms that the superior mechanical properties of 16P-HE alloy are mainly due to its strongest interface strengthening(145 MPa)and grain boundary strengthening(189 MPa)from the sub-micron 18R phase andα-Mg grains.Moreover,the strengthening effect of 18R phase decreases gradually with their morphology changing from particles to fibers,and to blocks.The obtained results further deepen and broaden the strengthening-toughening theory of 18R phase. 展开更多
关键词 Magnesium alloys long period stacking ordered structure Plastic deformation Refinement Mechanical property
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Effects of Heat Treatments on Microstructures and Precipitation Behaviour of Mg_(94)Y_4Zn_2 Extruded Alloy 被引量:2
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作者 Huan Liu Feng Xue +2 位作者 Jing Bai Jian Zhou Yangshan Sun 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2014年第2期128-133,共6页
Microstructures and precipitation behaviours of Mg94Y4Zn2 (at. %) extruded alloy during solution treatment and ageing processes were investigated. Three major phases were observed in the as-cast Ug94Zn2Y4 alloy:α-... Microstructures and precipitation behaviours of Mg94Y4Zn2 (at. %) extruded alloy during solution treatment and ageing processes were investigated. Three major phases were observed in the as-cast Ug94Zn2Y4 alloy:α-Mg, block shaped 1 8R long period stacking ordered (LPSO) phase and Mg24Y5 cuboid particles. After homogenization and extrusion, the block shaped LPSO phase changed into plate-like shape aligned along the direction of extrusion. During solution treatment, a small fraction of LPSO phase was transformed from 18R structure to 14H type. The nano-scale β' phase with its close-packed planes being perpendicular to the direction of both α-Mg and LPSO structure was precipitated at ageing stage. The coexistence of β' and LPSO phase contributes to the strengthening of the alloy, with microhardness for the matrix and LPSO structures reaching 145.8 and 155,0 HV, respectively. 展开更多
关键词 Heat treatment Microstructure Precipitation behaviour Mg94Y4Zn2 alloy long period stacking ordered structure
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