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Towards tailoring basal texture of rolled Mg alloy sheet by recrystallization for high room-temperature formability: A review

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Journal of Magnesium and Alloys 2023年第11期11卷 3992-4010页

作者： T.Nakata s.kamado Nagaoka University of Technology 1603-1KamitomiokaNagaoka 940-2188Japan

Room-temperature(RT) formability is a key factor to broaden the applications of rolled Mg alloy sheets in the industry. However, rolled Mg alloy sheets generally form strong basal texture, where the(0001) poles align parallel to the normal direction(ND). This hinders the activation of(0001) [1120] basal slip, limiting the RT formability. Therefore, texture weakening, i.e., the inclination of the(0001) poles from the ND, plays an important role to improve the RT formability. Recrystallization is crucial to control the textural development in Mg,and currently, the texture weakening is commonly achieved using static recrystallization(sRX). However, the type of slipping and twinning,which are activated during rolling, affect the textural features after sRX. It is also demonstrated that shear bands and preferential grain growth are important factors to tailor the texture during sRX. Indeed, dynamic recrystallization(DRX) easily occurs during rolling in Mg, which also affects the final rolling texture, while the effect of DRX on the textural formation is not extensively studied for the development of RT-formable Mg alloy sheets. Therefore, the effect of these factors on the textural development in rolled Mg is reviewed in this ***, the ideal microstructure and texture for RT-formable Mg alloy sheets are still controversial. The RT-formability includes stretch forming(biaxial tension), bending(plane strain tension), and deep-drawing. In particular, the stretch forming is commonly used to evaluate the RT-formability of rolled Mg. Although the stretch formability has been improved by recent studies, the further improvement is necessary owing to the relatively low formability of rolled Mg compared with that of rolled Fe and Al. Based on the relationship between the microstructure/texture and stretch formability provided in the literature, the design guidance for high stretch formability is proposed in this review.

关键词： Magnesium alloy Rolling Recrystallization Texture Formability

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Origin of extension twinning-mediated static recrystallization and unique parallel alignment of(0001) poles to transverse direction in Mg-3Al-0.4Mn(mass%) alloy sheet

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Journal of Magnesium and Alloys 2023年第9期11卷 3200-3213页

作者： T.Nakata C.Xu L.Geng s.kamado Nagaoka University of Technology 1603-1KamitomiokaNagaoka 940-2188Japan school of Materials science and Engineering Harbin Institute of Technology Harbin 150001China

The origin of unique parallel alignment of(0001) poles to transverse direction(TD) was investigated using Mg-3Al-0.4Mn(mass%)alloy sheets rolled with different process conditions. When rolling was performed with intermediate reheating, the alloy showed a sluggish static recrystallization(sRX) behavior during post-annealing, facilitating the nucleation and growth of statically recrystallized grains from extension twins. This resulted in the apparent texture component with the parallel alignment of the(0001) poles to the TD, and the sheet exhibited good ductility for both the rolling direction(RD) and TD. In contrast, continuous rolling without intermediate reheating led to the formation of severely deformed regions near double twins. sRX was promoted at such regions, forming a typical basal textural feature with weak RD-split of the(0001) poles. Although extension twins were formed after the continuous rolling, sRX was facilitated at the severely deformed regions with double twins, and the formation of the unique alignment of the(0001) poles to the TD was suppressed. The RD-split texture led to the large elongation to failure along the RD, while it along the TD decreased owing to the narrow distribution of the(0001)poles toward the TD, resulting in the in-plane anisotropy in ductility.

关键词： Magnesium Rolling Twinning static recrystallization Texture

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Dynamic microstructure evolution and mechanical properties of dilute Mg-Al-Ca-Mn alloy during hot rolling

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Journal of Materials science & Technology 2022年第34期129卷 1-14页

作者： shiwei Xu Congcong Zhu Zhanhong Lin Chen Jin s.kamado K.Oh-ishi Yun Qin College of Materials science and Engineering Hunan UniversityChangsha 410082China state Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Qinghai salt Lake Teli Magnesium Co.Ltd. Xining 810000China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan Toyota Central R&D Labs. Inc.41-1 YokomichiNagakuteAichi 480-1192Japan Research Institute(R&D Centre) Baowu Steel Group CorporationShanghai 201900China

The dynamic microstructure and texture of dilute Mg-0.50Al-0.71Ca-0.33Mn(wt.%) during hot rolling at two slab temperatures were investigated by electron backscattered diffraction(EBsD) and high resolution transmission electron microscopy(HRTEM). The results show that the development of the rolling microstructures is to first form {10–12} extension twins in the original grains, thereby forming the extension-twinned regions, and then to further form {10–11}-{10–12} double twins and kinks in the extension-twinned regions, and finally to form continuous dynamic recrystallized(continuous DRXed)grains in the double twins and the cross parts of the shear-deformed coarse extension-twinned *** extension twins, double twins and kinks show a decisive effect on the formation of rolling *** number of {10–11}-{10–12} double twins and resultant the continuous DRX process are strongly affected by the rolling slab temperature and the reduction thickness per pass. By optimizing the rolling conditions, texture and microstructures of the multi-pass rolled Mg-Al-Ca-Mn alloy sheets are successfully modified. Although the total alloy content is only 1.5 wt.%, these Mg-Al-Ca-Mn alloy sheets show much higher strength than the commercial Mg-3Al-1 Zn(wt.%)(AZ31B) sheet.

关键词： Mg-Al-Ca-Mn alloy Hot rolling Dynamic recrystallization Texture control Mechanical properties

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Improvement of strength and ductility synergy in a room-temperature stretch-formable Mg-Al-Mn alloy sheet by twin-roll casting and low-temperature annealing

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Journal of Magnesium and Alloys 2022年第4期10卷 1066-1074页

作者： T.Nakata C.Xu K.Kaibe Y.Yoshida K.Yoshida s.kamado Nagaoka University of Technology 1603-1KamitomiokaNagaoka 940-2188Japan school of Materials science and Engineering Harbin Institute of Technology Harbin 150001China sumitomo Electric Industries Ltd.1-1-1 KoyakitaItami 664-0016Japan

strength and ductility synergy in an Mg-3mass%Al-Mn(AM30)alloy sheet was successfully improved via twin-roll casting and annealing at *** AM30 alloy sheet produced by twin-roll casting,homogenization,hot-rolling,and subsequent annealing at 170℃ for 64 h exhibits a good 0.2%proof stress of 170 MPa and a large elongation to failure of 33.1%along the rolling *** sheet also shows in-plane isotropic tensile properties,and the 0.2%proof stress and elongation to failure along the transverse direction are 176 MPa and 35.5%,*** the sheet produced by direct-chill casting also shows moderate strengths if the annealing condition is same,the direct-chill casting leads to the deteriorated elongation to failure of 23.9%and 30.0%for the rolling and transverse directions,*** well as such excellent tensile properties,a high room-temperature stretch formability with an Index Erichsen value of 8.3 mm could be obtained in the twin-roll cast sheet annealed at 170℃ for 64 *** annealing at a higher temperature further improves the stretch formability;however,this results in the decrease of the tensile *** characterization reveals that the excellent combination of strengths,ductility,and stretch formability in the twin-roll cast sheet annealed at the low-temperature annealing is mainly attributed to the uniform recrystallized microstructure,fine grain size,and circular distribution of(0001)poles away from the normal direction of the sheet.

关键词： Magnesium Rolling Tensile property Room temperature formability Twinning

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Microstructure and mechanical properties of extruded Mg-6.5Gd-1.3Nd-0.7Y-0.3Zn alloy

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Transactions of Nonferrous Metals society of China 2010年第B7期20卷 508-512页

作者：侯秀丽曹占义张蕾蕾房大庆徐世伟 s.kamado 王立民 Key Laboratory of Automobile Materials Ministry of EducationJilin University state Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences Department of Mechanical Engineering Nagaoka University of Technology

The Mg-6.5Gd-1.3Nd-0.7Y-0.3Zn alloy ingot and sheet were prepared by casting and hot extrusion techniques,and the microstructure,age hardening behavior and mechanical properties were *** results show that the as-cast alloy mainly containsα-Mg solid solution and compounds of Mg5RE and Mg24RE5(RE=Gd,Y and Nd)*** grain size is refined after hot extrusion,and the Mg5RE and Mg24RE5 compounds are broken during the extrusion *** extruded alloy exhibits remarkable age hardening response and excellent mechanical properties in the peak-aging *** ultimate tensile strength,yield strength and elongation are 310 MPa,201 MPa and 5.8%at room temperature,and 173 MPa,133 MPa and 25.0%at 300℃,respectively.

关键词： Mg-Gd based alloy extrusion age hardening behavior microstructure mechanical property

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Optimization of Cu content for the development of high-performance T5-treated thixo-cast Al-7si-0.5Mg-Cu(wt.%)alloy

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Journal of Materials science & Technology 2021年第34期93卷 178-190页

作者： K.Yamamoto M.Takahashi Y.Kamikubo Y.sugiura s.Iwasawa T.Nakata s.kamado Nagaoka University of Technology NagaokaJapan Asanuma Giken Co. Ltd.HamamatsuJapa Industrial Research Institute of shizuoka Prefecture ShizuokaJapan

Cu content has been successfully optimized in a thixo-cast and directly aged(T5-treatment)Al-7 si-0.5 Mg(wt.%)*** after the 0.5%Cu addition,plate-like Al_(2)Cu(θ’)phases,which contribute to high strengths and large plasticity,are *** formation of a large fraction of Cu-containing brittle phases could be suppressed as ***,the Al-7si-0.5Mg-0.5Cu alloy exhibits high ultimate tensile strength,0.2%proof stress,and elongation to failure of 296 MPa,209 MPa,and 8.8%,*** results in a high quality index similar to that of solution-treated and subsequently aged(T6-treated)Al-7 si-Mg alloys.A Cu addition over 1.0%further improves the strengths;however,this leads to poor ductility because of the high fraction of Cu-containing brittle phases.

关键词： Al-si-Mg-Cu alloy Thixo-casting T5-treatment Mechanical property Microstructure

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Effect of hot extrusion on microstructure and mechanical properties of quasicrystal-reinforced Mg-Zn-Yalloy

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中国有色金属学会会刊：英文版 2005年第4期15卷 715-721页

作者：郑明毅乔晓光徐世伟甘为民吴昆 s.kamado Y.Kojima H.G.Brokmeier school of Materials scienceand Engineering Harbin Institute of Technology Department of Mechanical Engineering Nagaoka University of Technology Institute of Materials Engineering GKSS-Research Center

The microstructure and mechanical properties of as-cast and as-extruded Mg-Zn-Y alloy （Mg-11%Zn-0.9%Y, mass fraction） containing Mg3YZn6 quasicrystal were studied. The eutectic icosahedral quasicrystal phase （I-phase） is broken and almost distributes along the extrusion direction, and fine I-phase with nano-size is precipitated during the extrusion. The α-Mg matrix grains are refined due to recrystallization occuring during the hot extrusion. some {1012} twins are observed in the extruded ZW1101 alloy. And {0002}〈1010〉 fiber texture is formed in matrix alloys after hot extrusion. The extruded alloy exhibits high strength in combination with large elongation at room temperature. The strengthening mechanism of the as-extruded alloy was discussed.

关键词：镁合金微结构热突出锌

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Enhancing strength and creep resistance of Mg-Gd-Y-Zn-Zr alloy by substituting Mn for Zr

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Journal of Magnesium and Alloys 2019年第3期7卷 388-399页

作者： C.Xu T.Nakata G.H.Fan X.W.Li G.Z.Tang s.kamado school of Materials science and Engineering Harbin Institute of TechnologyHarbin 150001PR China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan school of Material science and Engineering Harbin University of Science and TechnologyHarbin 150040PR China

The age-hardening behavior and mechanical properties of the extruded Mg-2Gd-1.2Y-0.5Zn(at.%)alloy with Zr or Mn additions were *** results show that Mn added alloy exhibits more remarkable age-hardening response than Zr added alloy,which is attributed to the fact that partitioning of Mn into the β'phases,β'precipitates and long period stacking ordered(LPsO)phases leads to the decrement in(G d+Y)concentrations in the second phases,facilitating the precipitation during aging *** peak-aged alloys show bimodal microstructure comprising the fine DRXed grains with nano-sized β phases pinned at DRXed grain boundaries as well as coarse worked grains with strong fiber *** strength and good thermal stability were obtained in both peak-aged Mn and Zr added *** the peak-aged Mn added alloy shows higher strength and superior creep resistance due to its denser β'precipitates,thin LPsO phases and γ'precipitates and higher area fraction of worked grains with strong fiber *** 0.2% tensile proof stress and ultimate tensile strength of peak-aged Mn added alloy reach up to 454 MPa and 508 MPa,respectively,with elongation of 3.2%at room *** minimum creep rate of the peak-aged Mn added alloy at 250℃/150 MPa is 2.4 × 10^-8 s^-1,which is superior than previously reported extruded Mg-Gd based alloys.

关键词： Magnesium alloys Rare earth(RE) Precipitation Mechanical properties Creep resistance

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simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Forging

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Acta Metallurgica sinica(English Letters) 2021年第2期34卷 265-277页

作者： L.B.Tong J.H.Chu D.N.Zou Q.sun s.kamado H.G.Brokmeier M.Y.Zheng school of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055China school of Materials science and Engineering.Harbin Institute of Technology Harbin 150001China College of Materials science and Engineering.Jilin University Changchun 130025China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan Institute of Materials science and Engineering Clausthal University of TechnologyAgricolastrasse 638678 Clausthal-Zellerfeld.Germany

In this study,the mechanical properties and damping capacities of cast Mg-5.5 Zn-0.6 Zr(weight percent,ZK60)alloys have been simultaneously improved by a facile multi-directional forging(MDF)processing,and the mechanisms of microstructure evolution and texture modification are systematically *** activation of tension twinning occurs during the initial MDF stage,due to the coarse-grained structure of the as-cast *** increasing MDF passes,the continuous dynamic recrystallization(CDRX)results in a fine equiaxed-grain *** typical non-basal texture is formed in the as-MDFed alloy for 6 passes,with the(0001)planes inclined 60°–70°to forged direction and 10°–20°to transverse direction,respectively.A good balance between the strength(~194.9 MPa)and ductility(~24.9%)has been achieved,which can be ascribed to the grain refinement,non-basal texture and fine precipitate *** damping capacity is remarkably improved after MDF processing,because the severe deformation increases the dislocation density,which effectively enlarges the sweep areas of mobile dislocations.

关键词： Mg alloy Multi-directional forging Microstructure Texture evolution Mechanical properties Damping capacity

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Development of a high-strength Mg alloy with superior ductility through a unique texture modification from equal channel angular pressing

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Journal of Magnesium and Alloys 2021年第3期9卷 1007-1018页

作者： L.B.Tong J.H.Chu W.T.sun Z.H.Jiang D.N.Zou s.F.Liu s.kamado M.Y.Zheng school of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055China school of Materials science and Engineering Harbin Institute of TechnologyHarbin 150001China school of Materials science and Engineering Jilin UniversityChangchun 130025China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan

In the current study,a homogenous ultra-fine grained microstructure with average grain size of 1.0μm is achieved in the Mg-Zn-Ca-Mn alloy through the reduplicative equal channel angular pressing(ECAP)at 300℃,and the mechanical properties are remarkably improved,with room-temperature yield strength of 269.6 MPa and elongation of 22.7%.The twinning deformation results in a discontinuous recrystallization behavior in the initial stage of *** further deformation,the continuously dynamic recrystallization contributes to an obvious grain refinement *** activation of non-basal slip system leads to the formation of a unique basal texture,which is related to the elevated ECAP temperature and the decreased grain *** grain refinement and texture modification derived from ECAP process result in the increase of yield strength,while the cracked secondary phase particles are beneficial to the enhanced ductility,through reducing the stress concentration and hindering premature failure.

关键词： Mg alloy ECAP Microstructural evolution High strength superior ductility

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