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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 manuscript.Additionally, 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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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 low-temperature.An 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 direction.the 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%,respectively.though 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,respectively.As 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 h.the annealing at a higher temperature further improves the stretch formability;however,this results in the decrease of the tensile properties.Microstructure 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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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.%)alloy.Even after the 0.5%Cu addition,plate-like Al_(2)Cu(θ’)phases,which contribute to high strengths and large plasticity,are precipitated.the formation of a large fraction of Cu-containing brittle phases could be suppressed as well.then,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%,respectively.this 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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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 investigated.the 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 treatment.Both 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 texture.High strength and good thermal stability were obtained in both peak-aged Mn and Zr added alloys.While 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 texture.the 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 temperature.the 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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Quasi-in-situ observing the rare earth texture evolution in an extruded Mg-Zn-Gd alloy with bimodal microstructure

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Journal of Magnesium and Alloys 2021年第5期9卷 1818-1827页

作者： M.G.Jiang C.Xu H.Yan t.nakata Z.W.Chen C.S.Lao R.S.Chen S.Kamado E.H.Han College of Mechatronics and Control Engineering Shenzhen University3688 Nanhai AveShenzhen 518060China the Group of Magnesium Alloys and their Applications Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan

the static recrystallization and associated texture evolution were investigated in an extruded Mg-Zn-Gd alloy with bimodal microstructure based on a quasi-in-situ electron back-scatter diffraction(EBSD)method.the typical rare earth(RE)texture formed during annealing,evolving from the bimodal microstructure with[1010]basal fiber texture that consisted of fine recrystallized(RXed)grains and coarse unrecrystallized(un RXed)grains elongated along the extrusion direction.In both RXed and un RXed regions,the RXed nucleation produced randomized orientations without preferred selection and the RXed grains with RE texture orientation had more intensive growth ability than those with basal fiber orientation,thereby leading to the preferred selection of RE texture orientation during grain growth.the relationships between stored strain energy,solute drag,grain growth and texture evolution are discussed in detail.this study provided direct evidence of the RE texture evolution in an extruded Mg-RE alloy,which assists in understanding the formation mechanisms for RE texture during extrusion and better developing wrought Mg alloys with improved formability.

关键词： Magnesium alloy Rare earth texture Extrusion Annealing Recrystallization

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Effect of forced-air cooling on the microstructure and age-hardening response of extruded Mg-Gd-Y-Zn-Zr alloy full with LPSO lamella

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Journal of Materials Science & technology 2021年第14期73卷 66-75页

作者： S.Z.Wu t.nakata G.Z.tang C.Xu X.J.Wang X.W.Li X.G.Qiao M.Y.Zheng L.Geng S.Kamado G.H.Fan School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Research Center for Advanced Magnesium technology Nagaoka University of TechnologyNagaoka 940-2188Japan School of Material Science and Engineering Harbin University of Science and TechnologyHarbin 150040China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 211816China

the homogenized Mg-8.2 Gd-3.8 Y-1.0 Zn-0.4 Zr(wt.%)alloy full of plate-shaped long period stacking ordered(LPSO)phases was hot extruded in the atmosphere and cooled by the forced-air,then the effect of forced-air cooling on the microstructure and age-hardening response of the alloy was investigated in this work.the results show that in comparison with the extruded sample cooling in the atmosphere,the forced-air cooling restricts dynamic recrystallization(DRX)and brings about finer dynamic recrystallized(DRXed)grain size,stronger basal texture and higher dislocation density.Furthermore,the forced-air cooling promotes the dynamic precipitation in the DRXed regions and facilitates formation of plate-shaped LPSO phases andγ’phases with smaller interspacing in the unrecrystallized(un DRXed)regions,then slightly restricts the precipitation ofβphases during aging.After peak-ageing treatment,the extruded sample with forced-air cooling shows superior tensile properties with a tensile yield strength of 439 MPa,an ultimate tensile strength of 493 MPa,and elongation to failure of 18.6%.

关键词： Mg-RE alloy LPSO phase Dynamic recrystallization Precipitation Mechanical properties

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慢性血栓栓塞性肺动脉高压病人在球囊血管成形术前后的肺灌注血容量Ct、肺灌注SPECt、肺血管造影的临床及预测价值比较

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国际医学放射学杂志 2019年第1期 125-125页

作者： H.Koike E.Sueyoshi I.Sakamoto M.Uetani t.nakata K.Maemura 潘海燕 Department of Radiology Nagasaki University Graduate School of Biomedical Sciences

摘要目的使用双能量Ct计算肺灌注血容量(PBV)诊断肺血栓栓塞已被广泛接受。本研究评价慢性血栓栓塞性肺高压(CtEPH)病人在球囊肺血管成形术(BPA)前、后的肺

关键词：慢性血栓 SPECt Ct 肺灌注肺血管造影血容量栓塞性

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the deterministic condition for the ground reaction force acting point on the combined knee valgus and tibial internal rotation moments in early phase of cutting maneuvers in female athletes

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Journal of Sport and Health Science 2024年第3期13卷 376-386页

作者： Issei Ogasawara Ken Ohta Gajanan S.Revankar Shoji Konda Yohei Shimokochi Hideyuki Koga Ken nakata Department of Health and Sport Sciences Graduate School of MedicineOsaka UniversityToyonaka 560-0043Japan Sports Sensing Co. LTD.Fukuoka 815-0035Japan Department of Neurology Graduate School of MedicineOsaka UniversitySuita 565-0871Japan Department of Health and Sport Management Osaka University of Health and Sport SciencesSennan-gun 590-0496Japan Department of Joint Surgery and Sports Medicine Graduate School of Medical and Dental SciencesTokyo Medical and Dental UniversityBunkyo-ku 113-8519Japan

Background:Combined knee valgus and tibial internal rotation(VL+IR)moments have been shown to stress the anterior cruciate ligament(ACL)in several in vitro cadaveric studies.to utilize this knowledge for non-contact ACL injury prevention in sports,it is necessary to elucidate how the ground reaction force(GRF)acting point(center of pressure(CoP))in the stance foot produces combined knee VL+IR moments in risky maneuvers,such as cuttings.However,the effects of the GRF acting point on the development of the combined knee VL+IR moment in cutting are still unknown.Methods:We first established the deterministic mechanical condition that the CoP position relative to the tibial rotational axis differentiates the GRF vector’s directional probability for developing the combined knee VL+IR moment,and theoretically predicted that when the CoP is posterior to the tibial rotational axis,the GRF vector is more likely to produce the combined knee VL+IR moment than when the CoP is anterior to the tibial rotational axis.then,we tested a stochastic aspect of our theory in a lab-controlled in vivo experiment.Fourteen females performed 60˚cutting under forefoot/rearfoot strike conditions(10 trials each).the positions of lower limb markers and GRF data were measured,and the knee moment due to GRF vector was calculated.the trials were divided into anterior-and posterior-CoP groups depending on the CoP position relative to the tibial rotational axis at each 10 ms interval from 0 to 100 ms after foot strike,and the occurrence rate of the combined knee VL+IR moment was compared between trial groups.Results:the posterior-CoP group showed significantly higher occurrence rates of the combined knee VL+IR moment(maximum of 82.8%)at every time point than those of the anterior-CoP trials,as theoretically predicted by the deterministic mechanical condition.Conclusion:the rearfoot strikes inducing the posterior CoP should be avoided to reduce the risk of non-contact ACL injury associated with the combined knee VL+IR stress.

关键词： Center of pressure Deterministic condition Foot strike pattern Injury mechanism Moment of ground reaction force

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肝门部胆管癌R0切除后复发模式

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肝胆外科杂志 2010年第6期18卷 403-403页

作者： A.Kobayashi S.Miwa t.nakata S.Miyagawa 王平刘付宝

背景：手术切除是肝门部胆管癌患者获得长期生存唯一手段。随着外科技术和围手术期处理的进步,肝门部胆管癌患者短期存活发生巨大改变。但由于术后高的复发率使患者的长期存率仍低。但对肝门部胆管癌根治性切除后复发模式研究较少。

关键词：肝门部胆管癌复发模式切除后围手术期处理癌患者长期生存手术切除外科技术

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