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Thermomechanical Processing and Superplasticity of AZ91 Magnesium Alloy

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j.urnal of Materials Science & Technology 2004年第3期20卷 295-297页

作者： RongshiCHEN j.j.blandin M.Suéry QudongWANG EnhouHAN StateKeyLabforCorrosionandProtection InstituteofMetalResearchChineseAcademyofSciencesShenyang110016China InstitutNationalPolytechniquedeGrenoble(INPG)GéniePhysiqueetMécaniquedesMatériaux(GPM2) UMRCNRS5010ENSPGBP4638402Saint-Martind'HéresCedexFrance SchoolofMaterialsScience&Engineering NationalResearchCenterofLightAlloyNetFormingEngineeringShanghaiJiaoTongUniversityShanghai200030China

The effect of extrusion on grain refinement has been studied in the AZ91 cast ingots. It is found that grain sizesmaller than 10μm can be obtained by the extrusion processing. Vickers hardness measurements were also carriedout to evaluate the effect of these processes on the room temperature mechanical properties. The experimentalresults of high temperature tensile tests revealed that the stress was inversely proportional to the square of the grainsize and that the activation energy for superplastic flow was higher than that for grain boundary diffusion.

关键词： Magnesium alloy Thermo-mechanical treatment Superplasticity Mechanical properties

Influence of extrusion temperature on microstructure and mechanical properties of Mg-4Y-4Sm-0.5Zr alloy

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Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1311-1315页

作者：李大全王渠东丁文江 j.j.blandin M.SUéRY National Engineering Research Center for Nonferrous Metals Composites General Research Institute for Nonferrous Metals National Engineering Research Center of Light Alloys Net Forming State Key Laboratory of Metal Matrix CompositesSchool of Materials Science and EngineeringShanghai Jiao Tong University Universitéde Grenoble Grenoble INPScience et Ingénieriedes Matériaux et Procédés(SIMAP) CNRS UMR 5266UJFBP 4638402 Saint-Martin d'Héres CedexFrance

The solution-treated Mg-4Y-4Sm-0.5Zr alloy was extruded at temperatures from 325℃ to 500℃.Dynamic recrystallization(DRX) completely occurs when the alloy is extruded at 350℃and *** grains of the extruded alloy are obviously refined by the occurrence of *** average grain size of the extruded alloy increases with increasing the extrusion temperature,leading to a slight decrease of the ultimate tensile strength(UTS) and the yield strength(YS) .On the contrary,the UTS and YS of the extruded and aged alloy increase with increasing the extrusion *** of UTS of 400 MPa,YS larger than 300 MPa and elongation(EL) of 7%are achieved after extrusion at 400℃ and ageing at 200℃ for 16 *** grain refinement and precipitation are efficient strengthening mechanisms for the Mg-4Y-4Sm-0.5Zr alloy.

关键词： Mg-Y-Sm-Zr alloy extrusion heat treatment ageing mechanical properties

Homogeneous Plastic Flow of Fully Amorphous and Partially Crystallized Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Bulk Metallic Glass

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j.urnal of Materials Science & Technology 2003年第6期19卷 557-560页

作者： Q.WANG j.j.blandin M.Suery B.Van de Moortele j.M.Pelletier GPM2 ENSPG D.U. B.P.46 38042 Grenoble France Institute of Materials Shanghai University Shanghai 200072 ChinaGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex France

The homogeneous plastic flow of fully amorphous and partially crystallized Zr(41.2)Ti(13.8)Cu(12.5)Ni(10)Be(22.5) bulk metallic glass (Vitl) has been investigated by compression tests at high temperatures in supercooled liquid region. Experimental results show that at sufficiently low strain rates, the supercooled liquid of the fully amorphous alloy reveals Newtonian flow with a linear relationship between the flow stress and strain rate. As the strain rate is increased, a transition from linear Newtonian to nonlinear flow is detected, which can be explained by the transition state theory. Over the entire strain rate interval investigated, however, only nonlinear flow is present in the partially crystallized alloy, and the flow stress for each strain rate is much higher. It is found that the strain rate-stress relationship for the partially crystaltized alloy at the given temperature of 646 K also obeys the sinh law derived from the transition state theory, similar to that of the initial homogeneous amorphous alloy. Thus, it is proposed that the flow behavior of the nanocrystalline/amorphous composite at 646 K is mainly controlled by the viscous flow of the remaining supercooled liquid.

关键词： Homogeneous plastic flow Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloy,Partially crystallized amorphous alloy

热处理对挤压添加钙AM50镁合金组织及力学性能的影响

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机械工程材料 2006年第8期30卷 5-9页

作者：王渠东彭建国丁文江米歇尔.塞维基恩.杰克.布兰丁上海交通大学轻合金精密成型国家工程研究中心上海200030 格勒诺布尔国家理工学院

研究了固溶、时效对挤压添加钙的三种AM50镁合金组织和力学性能的影响。结果表明:合金挤压后,随着固溶时间的增加,Mg17Al12相以弥散状溶解在基体镁中,而Al2Ca相相当稳定,部分变细,逐步断开并出现球化现象;随着时效时间的增加,Mg17Al12... 详细信息

研究了固溶、时效对挤压添加钙的三种AM50镁合金组织和力学性能的影响。结果表明:合金挤压后,随着固溶时间的增加,Mg17Al12相以弥散状溶解在基体镁中,而Al2Ca相相当稳定,部分变细,逐步断开并出现球化现象;随着时效时间的增加,Mg17Al12相以粒状从基体中析出,而Al2Ca相在时效过程中变化极小。固溶后,挤压合金的硬度和抗拉强度下降。时效后,挤压添加1％Ca的合金抗拉强度略有升高,未加和加入2％Ca的抗拉强度略有下降,三种合金的硬度增加到峰值后逐步下降。未加和加入2％Ca的合金固溶后塑性显著增加,时效后塑性略有下降;而加入1％Ca的合金固溶后塑性略有下降,时效后塑性显著提高。

关键词： AM50镁合金挤压热处理钙