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超声振动辅助微压印成形及其作用机制
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作者 翟继强 管延锦 +2 位作者 陈凤娇 林军 初宏强 《塑性工程学报》 CAS CSCD 北大核心 2023年第6期187-193,共7页
进行了不同条件下的超声振动辅助微压印实验,并利用有限元方法分析了实验结果。结果表明,坯料高度较小时,超声振动能够显著提高微圆柱压印高度,最大增幅为350%。微圆柱压印高度随着超声作用时间的增加而增加,但当超声作用时间超过10 s后... 进行了不同条件下的超声振动辅助微压印实验,并利用有限元方法分析了实验结果。结果表明,坯料高度较小时,超声振动能够显著提高微圆柱压印高度,最大增幅为350%。微圆柱压印高度随着超声作用时间的增加而增加,但当超声作用时间超过10 s后,材料达到超声振动条件下的成形极限,继续延长超声作用时间不再有明显的作用。超声表面效应使摩擦因数降低了76.4%,对微圆柱压印高度的增长起到主要作用,贡献率为94.8%,超声体积效应使材料流动应力下降了16.8 MPa,对微圆柱压印高度增长的贡献率仅为5.2%。 展开更多
关键词 超声振动 微压印 体积效应 表面效应 作用机制
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限制模压变形和超声喷丸复合工艺对AZ31镁合金表层组织及硬度的影响 被引量:3
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作者 黄庆国 朱立华 +3 位作者 王宗申 管延锦 陈浩 于从潇 《中国有色金属学报》 EI CAS CSCD 北大核心 2021年第3期623-638,共16页
以AZ31镁合金板材为实验材料,先对其进行限制模压变形,再利用超声喷丸技术进行表面处理,研究限制模压变形和超声喷丸复合工艺对材料表层组织和硬度的影响。结果表明:限制模压变形和超声喷丸具有叠加效果,该复合工艺相对于单一工艺能进... 以AZ31镁合金板材为实验材料,先对其进行限制模压变形,再利用超声喷丸技术进行表面处理,研究限制模压变形和超声喷丸复合工艺对材料表层组织和硬度的影响。结果表明:限制模压变形和超声喷丸具有叠加效果,该复合工艺相对于单一工艺能进一步减小AZ31镁合金的晶粒尺寸,增强表面硬度。经复合工艺处理后,AZ31镁合金的最小平均晶粒尺寸为7.52μm,相比于原始试样细化43.16%;表面硬度最高达到236 HV,相比于原始试样提高306.90%。此外,与限制模压变形相比,超声喷丸对AZ31镁合金表层组织和硬度的影响更加明显。其中,随着喷丸时间的增加,晶粒逐渐细化,硬度不断升高,但当处理时间达到400 s时,晶粒尺寸不再有明显减小,硬度达到一定极限不再变化。 展开更多
关键词 AZ31镁合金 限制模压变形 超声喷丸 晶粒细化 硬度提高
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Effects of ultrasonic vibration on performance and microstructure of AZ31 magnesium alloy under tensile deformation 被引量:8
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作者 XIE Zhen-dong guan yan-jin +2 位作者 YU Xiao-hui ZHU Li-hua LIN Jun 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第7期1545-1559,共15页
Ultrasonic vibration can reduce the forming force, decrease the friction in the metal forming process and improve the surface quality of the workpiece effectively. Tensile tests of AZ31 magnesium alloy were carried ou... Ultrasonic vibration can reduce the forming force, decrease the friction in the metal forming process and improve the surface quality of the workpiece effectively. Tensile tests of AZ31 magnesium alloy were carried out. The stress–strain relationship, fracture modes of tensile specimens, microstructure and microhardness under different vibration conditions were analyzed, in order to study the effects of the ultrasonic vibration on microstructure and performance of AZ31 magnesium alloy under tensile deformation. The results showed that the different reductions of the true stress appeared under various ultrasonic vibration conditions, and the maximum decreasing range was 4.76%. The maximum microhardness difference among the 3 nodes selected along the specimen was HV 10.9. The fracture modes, plasticity and microstructure of AZ31 magnesium alloy also were affected by amplitude and action time of the ultrasonic vibration. The softening effect and the hardening effect occurred simultaneously when the ultrasonic vibration was applied. When the ultrasonic amplitude was 4.6 μm with short action time, the plastic deformation was dominated by twins and the softening effect was dominant. However, the twinning could be inhibited and the hardening effect became dominant in the case of high ultrasonic energy. 展开更多
关键词 ultrasonic vibration tensile test AZ31 magnesium alloy plastic behavior MICROSTRUCTURE
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