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Transactions of Nonferrous Metals Society of China 2010年第6期20卷 987-991页

作者：胡茂良吉泽升陈晓瑜 College of Materials Science and Engineering Harbin University of Science and Technology

A method for recycling AZ91D magnesium alloy scraps directly by hot extrusion was *** microstructural analyses were performed using the techniques of optical microscopy,scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).Microstructural observations revealed that all the recycled specimens consisted of fine grains due to the dynamic *** main strengthening mechanism of the recycled specimen was grain refinement strengthening and homogeneous distribution of oxide *** interfaces of individual scraps of extruded materials were not identified when the scraps were extruded with the extrusion ratio of *** layers of the scraps were broken into pieces by high compressive and shear forces under the extrusion ratio of *** ultimate tensile strength and elongation to failure increased with increasing the extrusion *** specimens with the extrusion ratio of 40:1 showed higher ultimate tensile strength of 342.61 MPa and higher elongation to failure of 11.32%,compared with those of the cast specimen.

关键词： extrusion ratio AZ91D magnesium alloy scraps mechanical property microstructure

Modifying microstructures and tensile properties of Mg-Sm based alloy via extrusion ratio

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Journal of Magnesium and Alloys 2021年第3期9卷 1098-1109页

作者： Kai Guan Rui Ma Jinghuai Zhang Ruizhi Wu Qiang Yang Jian Meng Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001PR China Department of Materials Engineering The University of TokyoTokyo 113-8656Japan State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China

Microstructure and tensile properties of a Mg-Sm-Zn-Zr alloy with various extrusion ratios(ERs)of 6.9,10.4 and 17.6 were systematically *** was identified that,greater ER increased dynamic recrystallization(DRX)fraction and coarsened DRX grains,which further suggests weakened basal fiber texture for the studied *** is mainly due to the rising temperature from massive deformation heat when *** a result,greater ER corresponds to a decreased strength but improved ***,transmission electron microscopy(TEM)observations reveal that the dominant intermetallic phase,Mg_(3)Sm,is metastable,and it will transform into Mg_(41)Sm_(5)during extrusion with *** transformation leads to the accumulation of surplus Sm and Zn atoms,which induces the precipitation of Sm Zn_(3)phase at the surface of Mg_(41)Sm_(5)matrix.

关键词： Magnesium alloys extrusion ratio Microstructure Phase transition Transmission electron microscopy Tensile properties

Influence of extrusion ratio on microstructure and texture developments of high-temperature extruded AZ31 Mg alloy

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Science China(Technological Sciences) 2012年第2期55卷 490-495页

作者： LI NaLi HUANG GuangJie XIN RenLong LIU Qing Department of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Experiments were conducted to evaluate the effects of extrusion ratio on the microstructure and texture developments of AZ31 Mg alloy during forward extrusion. The forward extrusion was undertaken at 400℃ with extrusion ratios of 10, 18, and 25 after the alloy was homogenized at 410℃ for 12 h. Partially recrystallized microstructures were observed in all the extruded rods examined. The texture of the large elongated deformed grains appeared strongly centered at （1010） dominating the extrusion texture, while the recrystallized grains exhibited much more randomized texture. For the alloy with the largest ER （25）, coarse secondary recrystallized grains were found which presented a different texture component with （11 2 0） parallel to the ED. The occurrence of the coarse secondary recrystallized grains in the alloy with the largest ER might be attributed to that the large ER raised the die exit temperature during extrusion and thus promoted significantly grain growth after the extruded rod exited from extrusion die. The intensities of different texture components varied with ER because ER affected the contents of the deformed grains, DRX grains and coarse secondary recrystallized grains. In particular, the maximum intensity of fiber texture was decreased as ER increased due to the decrease of the large elongated deformed grains.

关键词： magnesium alloy extrusion ratio texture

Effect of extrusion ratio on coating extrusion of Pb-GF composite wire by numerical simulation and experimental investigation

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Transactions of Nonferrous Metals Society of China 2009年第S02期19卷 453-457页

作者： WANG Xin SUN Hong-fei FANG Wen-bin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The extrusion ratio is one of the key parameters for manufacturing the lead-glass fiber(Pb-GF)composite wire by coating *** effect of extrusion ratio on coating extrusion of Pb-GF composite wire was studied by finite element numerical simulation with the use of the DEFOEM simulation *** simulation result shows that the higher the extrusion ratio,the higher the effective stress that the glass fiber bears during *** is also observed that the extrusion force increases with the increase of the extrusion *** extrusion experiment of Pb-GF composite wire reveals that extrusion ratio is changed by changing the quantity of glass fiber and composite *** rule that increasing the extrusion ratio enhances the coating speed limit suggests that the load on the glass fiber increases with increasing extrusion *** the simulation and the extrusion experiments show that the extrusion force increases with increasing extrusion ratio.

关键词： numerical simulation Pb-GF composite wire coating extrusion extrusion ratio

Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 136-146页

作者： Chenjin Zhang Guangyu Yang Lei Xiao Zhiyong Kan Jing Guo Qiang Li Wanqi Jie State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China College of Chemistry and Environmental Science Qujing Normal UniversityQujing 655011China

Microstructure,texture,and mechanical properties of the extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy were investigated at different extrusion temperatures(260 and 320℃),extrusion ratios(10:1,15:1,and 30:1),and extrusion speeds(3 and 6 mm/s).The experimental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy,and the second phase showed streamline distribution along the extrusion direction(ED).With extrusion temperature increased from 260 to 320℃,the microstructure,texture,and mechanical properties of alloys changed *** dynamic recrystallization(DRX)degree and grain sizes enhanced as the extrusion ratio increased from 10:1 to 30:1,and the strength gradually decreased but elongation(EL)*** the extrusion speed increased from 3 to 6 mm/s,the grain sizes and DRX degree increased significantly,and the samples presented the typical-rare-earth(RE)*** alloy extruded at 260℃ with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength(TYS)of 213 MPa and EL of 30.6%.After quantitatively analyzing the contribution of strengthening mechanisms,it was found that the grain boundary strengthening and dislocation strengthening played major roles among strengthening *** results provide some guidelines for enlarging the industrial application of extruded Mg-RE alloy.

关键词： Mg-rare earth alloys extrusion temperature extrusion ratio extrusion speed strengthening mechanisms

Microstructure and mechanical properties of as-extruded Mg-Sn-Zn-Ca alloy with different extrusion ratios

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Transactions of Nonferrous Metals Society of China 2018年第11期28卷 2191-2199页

作者： Yang ZHANG Xiao-yang CHEN Ya-lin LU Xiao-ping LI School of Materials Engineering Jiangsu University of TechnologyChangzhou 213001China School of Mechanical Engineering Jiangsu University of TechnologyChangzhou 213001China

The effect of extrusion ratio on microstructure and mechanical properties of as-extruded Mg-6Sn-2Zn-1Ca （TZX621）（mass fraction, %） alloy was investigated. It is found that incomplete dynamic recrystallization （DRX） took place in as-extrudedTZX621 alloy. As the extrusion ratio was increased from 6 to 16, both fraction of un-DRXed grains and average size of DRXedgrains in as-extruded TZX621 alloy decreased and the basal texture was weakened. Coarse CaMgSn phase was broken into particlesand fine Mg2Sn phase precipitated from α-Mg matrix during hot extrusion. Yield strength, ultimate tensile strength and elongation ofas-extruded TZX621 alloy with extrusion ratio of 16 reached 226.9 MPa, 295.6 MPa and 18.1%, which were improved by 36.0%,17.7% and 13.5%, respectively, compared to those of as-extruded TZX621 alloy with extrusion ratio of 6.

关键词： Mg-Sn alloy extrusion ratio microstructure texture mechanical properties

Microstructure and mechanical properties of Mg-Zn-Y-Zr alloy prepared by solid state recycling

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Transactions of Nonferrous Metals Society of China 2011年第2期21卷 265-271页

作者：赵祖德陈强杨林舒大禹赵志翔西南技术工程研究所重庆400039 煤炭科学研究总院重庆研究院重庆400039

Machined chips of Mg-Zn-Y-Zr alloy were consolidated by cold pressing and then hot extrusion under various processing temperatures and extrusion ratios. The results show that the microstructure of the chip-extruded alloy is marked by a large number of recrystallized grains and some unrecrystallized grains, which results in high strength but low ductility at temperatures below 320 ℃. With increasing processing temperature up to 360 ℃, entirely recrystallized and equiaxed grains are obtained. Mg-Zn-Y-Zr alloy with low strength but high ductility is obtained compared with the alloy processed at low temperature. At 420℃, coarse and equiaxed grains are formed, which results in the drastic decrease of mechanical properties. With increasing extrusion ratio from 8 to 16, the grain refinement is more obvious and the mechanical properties at room temperature are improved effectively. However, the yield strength and ultimate tensile strength are improved a little with further increasing extrusion ratio.

关键词： Mg-Zn-Y-Zr alloy extrusion ratio solid state recycling processing temperature

Effect of extrusion parameters on degradation of magnesium alloys for bioimplant applications:A review

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Transactions of Nonferrous Metals Society of China 2022年第9期32卷 2787-2813页

作者： Mahdi SHIRI Hassan JAFARI Raman SINGH Materials Engineering Department Faculty of Materials Engineering and Interdisciplinary SciencesShahid Rajaee Teacher Training University(SRTTU)16785-136 TehranIran Department of Mechanical&Aerospace Engineering and Department of Chemical Engineering 17 College Walk(Bldg 31)Monash University-Clayton Campus(Melbourne)Vic 3800Australia

Magnesium alloys,as a new generation temporary biomaterial,deserve the desirable biocompatibility and biodegradability,and also contribute to the repair of the damaged bone ***,they do not possess the required corrosion resistance in human body *** mechanical workings,such as extrusion,influence both the mechanical properties and bio-corrosion behavior of magnesium *** review aims to gather information on how the extrusion parameters(extrusion ratio and temperature)influence the bio-corrosion performances of magnesium *** effects are mainly ascribed to the alteration of extruded alloy microstructure,including final grain size and uniformity of grains,texture,and the size,distribution and volume fraction of the second *** recrystallization and grain refinement during extrusion provide a more homogeneous microstructure and cause the formation of basal texture,resulting in improved strength and corrosion resistance of magnesium *** temperature and extrusion ratio are reported as the influential factors in the *** reports reveal that the increase in extrusion ratio and/or the reduction in extrusion temperature cause a decrease in the final grain size,leading to intensification of basal texture,in parallel side of the samples with extrusion line,and to lower volume fraction and size of precipitates in magnesium *** all lead to improving the bio-corrosion resistance of the magnesium alloy implants.

关键词： magnesium alloys extrusion temperature extrusion ratio biodegradation microstructure

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Process,Microstructure and Properties of the RS-P/M Al-Li Alloy

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Rare Metals 1993年第3期12卷 203-208页

作者：匡建平袁冠森朱晓东刘援赵卓雍张少明 General Research Institute for Non-ferrous Metals Beijing 100088China

The Al-Li powder was prepared by argon *** compact Al-Li powder was canned into an aluminum container and degassed in vacuum and extruded into a bar at 400℃.The effect of extrusion ratio on the metallurgical consolidation of the powder has been studied,and the relationship of process- microstructure-property and the mechanism of age strengthening in the alloy were discussed also.

关键词： Al-Li alloys Rapid solidification extrusion ratio Metallurgical consolidation