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| 1 | AZ31镁合金板材经过连续弯曲变形后显微组织和成形性能的变化(英文)显示文摘通过采用连续弯曲(CB)工艺来改善AZ31镁合金板材的成形性能。通过光学显微镜(OM)和电子背散射技术(EBSD)研究镁合金板材的显微组织和织构的变化。结果表明:经过CB处理并退火后基面织构强度明显削弱;第一道次弯曲在内表面产生大量的孪晶,由于在第二道次过程中发生退孪生,孪晶密度明显下降;由于V形弯曲时内侧和外侧拉压应变状态的不对称性,连续弯曲过程中孪生-退孪生交替出现;与原始板材相比,经过连续弯曲处理板材的杯突值为5.2 mm,提高了41%,这主要是由于基面织构的弱化,以及织构弱化导致的较小的塑性应变比(r值)和较大的加工硬化指数(n值)。 | 韩廷状 黄光胜 王游根 王冠刚 赵炎春 潘复生 | 2016 | Transactions of Nonferrous Metals Society of China2016，26，8： | 4 |
| 2 | Improved strength and ductility of AZ31B Mg alloy sheets processed by accumulated extrusion bonding with artificial cooling显示文摘In this study,accumulated extrusion bonding(AEB)process with application of artificial water cooling was successfully performed to fabricate fined-grains AZ31B Mg alloy sheets at 150℃,200℃ and 250℃.The resultant microstructure and mechanical properties are systematically investigated.It reveals that the processing temperature has an important effect on the microstructural evolution during extrusion.During AEB process at 150℃ and 200℃,{10-12}tensile twinning was activated at early stage of extrusion,and subsequently continuous dynamic recrystallization(CDRX)occurred and dominated the further deformation.However,for the sample extruded at 250℃,hardly any twins can be observed,and new fined dynamic recrystallized grains were found along grain boundaries.Artificial cooling was utilized to reduce the rate of grain growth out of the extrusion die,resulting the grains significantly refined from 11μm to 2.5μm.Local high dislocation density region was also observed in the microstructure of sample processed at 150℃ in artificial cooling condition,and the degree decreased with the processing temperature increase.The results summarized from tensile tests indicated that due to the grain refinement the strength and ductility was significantly enhanced(YS of 186 MPa vs.145 MPa,UTS of 391 MPa vs.336 MPa and FE of 31.5%vs.24.5%compared with the as-received sample).Subsequently,annealing treatment at different temperatures was applied to eliminate the high dislocation density.The sample annealed at 200℃ exhibited the best comprehensive mechanical property with YS of 179 MPa,UTS of 390 MPa and FE of 33.0%.As the annealing temperature increasing,the dislocation density was reduced by static recrystallization(SRX)and grain growth,leading to a decreased strength and ductility. | Tingzhuang Han Jingfeng Zou Guangsheng Huang Lifeng Ma Chaojie Che Weitao Jia Lifei Wang Fusheng Pan | 2021 | Journal of Magnesium and Alloys2021，9，5： | 2 |
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