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Microstructure evolution of Mg-Zn-Zr magnesium alloy against soft steel core projectile

Journal of Materials Science & Technology 2021年第20期79卷 46-61页

作者： Abdul Malik Yangwei Wang Huanwu Cheng Faisal Nazeer Muhammad Abubaker Khan School of Material Science and Engineering Beijing Institute of TechnologyBeijing 100081China National Key Laboratory of Science and Technology on Materials under Shock and Impact Beijing 100081China

The study aimed to shed light on the post deformation and damage behavior of an extruded Mg-Zn-Zr alloy under a ballistic *** results revealed that the initial microstructure consisted of both{0001}basal and{1010}prismatic fiber *** impact,adiabatic shear bands,pronounce different twinning in big grains,,,andtypes of dislocations,and grain refinement through twinning induce recrystallization accommodated the strain,and absorbed∼65.7%of the energy during impact carried by a soft steel ***,the deformation behavior at the top broad sides of the crater was entirely *** weak basal texture was changed to a strong prismatic texture,which was further proved by typical sigmoidal compressive stress-strain curves.A revised model for the development of the ultra-fine grains adjacent to the crater has been *** microhardness and yield strength was∼33%and∼40%higher and chiefly ascribed to strain hardening in ultra-fine grained near the surface of the perforation *** exit of the perforation path was severely damaged and forms onion-shaped concentric rings which were comprised of melted zones,dimples,and *** on the all interesting findings,this study can be a clue for the development of the lightweight Mg alloy for military and aerospace applications.

关键词： Mg alloy Soft steel core Ballistic impact Texture Twin induce rotational dynamic recrystallization cdrx

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Effect of strain on DRX of 7050 aluminum alloy during extrusion at high temperature

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Rare Metals 2007年第S1期26卷 338-343页

作者： ZHU Danyang,ZHEN Liang,HU Wenhao,CHEN Junzhou,CUI Yuexian,and SHAO Wenzhu School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

Extrusion experiments with different filling contents at the temperature of 440 ℃ were conducted for solution treated 7050 aluminum *** microstructure of typical regions with different filler contents were described qualitatively and characterized quantitatively by electron backscattered diffraction technique(EBSD) and *** of deformed structure decrease continuously since ε=*** phase particles distribute dispersively and interact with dislocations when ε=0.66,which delays the occurrence of *** the strain increases,particles dissolve into the matrix,and their number reduces *** influence of particles on dislocation accumulation is impaired,so dislocations accumulate on the subgrain boundaries continuously,and lead to the transformation of subgrain boundaries into high angle grain boundaries(HAGBs).The continuous dynamic recrystallization(cdrx) occurrs at the strain of 0.81～*** ε=0.92,cdrx convert rapidly with the increase of HAGBs *** the size of cdrx grains is deduced to be minimum 3.3 μm by theoretical analysis,and it is obtained from experimental result that the maximal size of cdrx is 5.3 μm.

关键词： 7050 aluminum alloy extrusion experiment microstructure evolution cdrx

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VoLTE无线参数设置研究

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互联网天地 2016年第8期 48-51页

作者：王西点程楠赵文娟中国移动通信集团设计院有限公司北京100080

详细分析了LTE网络互操作邻区配置方法及参数设置,研究了无线链路失败、SPS、cdrx、LCP等功能的部分参数设置,以支撑未来VoLTE网络的参数配置需求。

关键词： VoLTE SPS cdrx LCP

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