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国家自然科学基金(51204020)

作品数:21 被引量:85H指数:6
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21 条 记 录,以下是 1-10
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Microstructure evolution and mechanical properties of Mg-7Gd-3Y-1Nd-1Zn-0.5Zr alloy被引量:1
2016年
X-ray diffraction (XRD), optical microscopy (OM), scanning electronic microscopy (SEM), transmission electron microscopy (TEM) and tensile tests at room temperature (RT) were performed to investigate the effect of homogenization on microstructure evolution and mechanical properties of Mg-7Gd-3Y-1Nd-1Zn-0.5Zr (mass fraction,%) alloy. The results indicate that the microstructure of the as-cast alloy is composed of α-Mg, (Mg, Zn)3RE phase and stacking fault (SF), the homogenization results in the disappearance of (Mg, Zn)3RE phase and stacking fault (SF) as well as the emergence of 14H-type long-period stacking ordered (LPSO) phase. The ultimate tensile strength (UTS), yield strength (YS) and elongation of the as-cast alloy are 187 MPa, 143 MPa and 3.1%, and the UTS, YS and elongation of the as-homogenized alloy are 229 MPa, 132 MPa and 7.2%, respectively.
李蒙张奎杜志伟李兴刚马鸣龙
Cu含量对Mg-2Zn合金组织及性能影响研究被引量:4
2020年
利用光学显微镜(OM)、 X射线衍射仪(XRD)、布氏硬度计、扫描电镜(SEM)、透射电镜(TEM)及Gleeble-1500D热模拟试验机等研究了Cu含量对Mg-2Zn合金显微组织及塑性变形行为的影响。获得了真应力-真应变曲线,进而得到了不同合金在不同变形条件下的动态再结晶临界条件。结果表明:铸态合金主要由α-Mg和共晶组织构成,其主要的第二相为MgCuZn相,随着Cu含量增加,合金中共晶组织体积分数不断增多,晶粒尺寸减小,硬度值升高;热压缩过程中高温时合金的流变应力峰值低于低温,高温促进了合金中位错运动;Cu含量的增加同样会降低合金的峰值应力, Cu含量高的合金经固溶处理后基体中Zn含量逐渐下降,对位错的阻碍作用减弱;合金应力-应变曲线和显微组织均表现出典型的动态再结晶特征,动态再结晶临界应力值随温度升高以及Cu含量增加均降低,合金再结晶程度随之增加;而且合金中MgCuZn相越多,合金的再结晶比例越高。
张万鹏马鸣龙马鸣龙李永军张奎王胜青
关键词:镁合金动态再结晶
EW75-0.7Al合金挤压、时效态的组织及力学性能被引量:2
2014年
通过OM、SEM、硬度及拉伸等测试手段,研究了EW75-0.7Al合金挤压及时效态的组织和力学性能。结果表明,挤压后合金晶粒明显细化,室温力学性能显著提高,抗拉强度为330MPa,屈服强度为242MPa,伸长率为11%。通过对合金进行T5时效处理,确定EW75-0.7Al合金的最佳T5峰时效制度为225℃×12h,经过T5峰时效处理后,合金的室温强度相比挤压态提高约100MPa。T5峰时效态合金在200℃高温下,力学性能下降不明显,在250℃高温下力学性能显著降低。通过分析合金高温下的断裂方式,发现250℃高温下,EW75-0.7Al合金的晶界强度显著降低,且时效析出相与基体的结合能力下降,最终导致合金在该温度下力学性能明显降低。
蒲治军张国栋李兴刚马鸣龙李永军石国梁袁家伟张奎
关键词:稀土镁合金力学性能
Effect of homogenization on microstructure and properties of WE91 alloys被引量:3
2013年
The microstructure and properties of the Mg-9Y-1MM-0.6Zr alloy were studied by scanning electron microscopy, optical microscopy, transmission electron microscopy, hardness and tensile testing. Homogenization was confirmed, and the solidification model was established. The as-cast alloy was mainly composed of ct-Mg and eutectic structures. The suitable homogenization pa- rameters were 535℃ for 18 h. Most of the eutectic structure dissolved in this process. Only the Mg4.26Y95.74 and Mg12 (MM) phases were remained in, and only a few microstructure occurred for prolonged time. The ultimate tensile strength of the alloy increased up to 232 MPa after homogenization, but the yield strength and the elongation were almost as same as the as-cast state. In the as-cast al- loys the cracks started in the eutectic structure, and then intergranular fracture occurred, but in the homogenate alloys residual phases became the source of the cracks and then tmnscrystalline fracture took place. The most important roles of homogenization were the decomposition of the eutectic structure, furthermore the intergranular fracture turned into a transcrystalline fracture, which was one of the main reasons to increase the strength of the alloys.
马鸣龙张奎李永军李兴刚石国梁
关键词:HOMOGENIZATIONMICROSTRUCTURE
热处理工艺及挤压对WE91合金组织及性能影响被引量:2
2016年
通过OM、SEM、XRD、TEM及力学性能测试等手段,研究了热处理工艺及挤压对WE91镁合金的显微组织及力学性能的影响。结果表明,铸态WE91合金主要由α-Mg基体及共晶组织构成。经过均匀化处理后,合金中大量的共晶组织回溶,主要的未溶相为Mg12(MM);经过挤压后,合金发生动态再结晶,晶粒尺寸明显减小,均匀化后残留的Mg12(MM)相沿挤压方向呈流线分布;WE91合金合理的时效热处理制度为225℃×28h,此时析出大量的长透镜片状β相;时效后合金具有较高的耐高温性能,250℃以下,合金的强度下降有限,达到300℃时,合金的强度显著下降。随着测试温度提高,合金裂纹萌生从晶内逐渐转移至晶界。
蒲治军马鸣龙张奎李兴刚
关键词:混合稀土镁合金显微组织高温性能
Hot Deformation Behavior of AZ40 Magnesium Alloy at Elevated Temperatures被引量:1
2017年
Hot compression tests on AZ40 magnesium alloy were conducted on a Gleeble 1500 d hot simulation testing machine in a deformation temperature range of 330 ℃-420 ℃ and a strain rate range of 0.002-2 s^-1. Hot deformation behaviors were investigated on the basis of the analysis of the flow stressstrain curves, constitutive equation, and processing map. The stress exponent and apparent activation energy were calculated to be 5.821 and 173.96 k J/mol, respectively. Deformation twins and cracks located in grain boundaries were generated at 330 ℃ and 0.02 s^-1, which are associated with a high strain rate and a limited number of available slip systems. With increasing temperature and decreasing strain rate, the twins disappeared and the degree of dynamic recrystallization increased. The alloy was completely dynamically recrystallized at 420 ℃ and 0.002 s^-1, with a homogenous grain size of approximately 13.7 μm. The instability domains of the deformation behavior can be recognized by processing maps. By considering the processing maps and characterizing the microstructure, the optimum hot deformation parameters in this experiment were determined to be 420 ℃ and 0.002 s^-1.
赖林张奎MA MinglongLI XinggangLI YongjunSHI GuoliangYUAN Jiawei
关键词:RECRYSTALLIZATION
Corrosion behaviors for peak-aged Mg-7Gd-5Y-lNd-0.5Zr alloys with oxide films被引量:1
2016年
The corrosion behaviors of T5 (225 ℃, 6.5 h) and T6 (460 ℃, 2 h + 225 ℃, 12 h) peak-aged Mg-7Gd- 5Y-1Nd-0.5Zr alloys with oxide films were investigated by optical microscope (OM), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The weight loss rates and electrochemical tests were also analyzed. The thicknesses of T5 and T6 oxide films are roughly 0.6 and 1.0 μm, respectively. The components of oxide films mainly consist of O, Mg, Y, Nd, and Gd, and the T6 oxide film results in surfaces with larger peaks than T5 oxide film. In addition, Y, Nd, and Gd peaks are all higher than those of Mg-7Gd-5Y- 1Nd-0.5Zr alloys, but Mg peak is consistently far below than that of the alloys. The specimens could be arranged in de- creasing order of corrosion rates and corrosion current densi- ties: T6 oxide film 〈 T5 oxide film 〈 T6 without oxide film 〈 T5 without oxide film. The oxide films are compact to increase the corrosion resistance for Mg-7Gd-5Y-1Nd-0.5Zr alloys, which will provide a guiding insight into the corrosion and protection of Mg-RE alloys in atmospheric environments.
Quan-Tong JiangKui ZhangXing-Gang LiYong-Jun LiMing-Long MaGuo-Liang ShiJia-Wei Yuan
Microstructure and phase compositions of as-cast Mg–3.9Zn–0.6RE(Gd,Y) alloy with different Gd/Y ratios被引量:12
2015年
Mg-Zn-RE (Gd, Y) alloys with different Gd/Y atomic ratios were prepared by conventional casting, and the microstructure of the alloys was studied by multiple means. Icosahedral quasicrystal phases are observed in all alloys. The different Gd/Y atomic ratios affect the micro- structures of the alloys irregularly. The alloy with more Gd has large dendritic structure and more complicated phase composition which are composed of I-phase lamellar eutectic, W-phase divorced eutectic, Mg-RE cuboid par- ticles and Mg-Zn binary phases. Other two alloys show similar microstructures and phase compositions with very thin lamellar eutectics which distribute along the inter- dendritic region, and the lamellar eutectics are formed by I-phase and Mg. The element contents of the I-phases and Mg-RE phases are partially controlled by the Gd/Y atomic ratio.
Yang YangKui ZhangMing-Long MaJia-Wei Yuan
关键词:MICROSTRUCTURE
残余应力研究现状及在镁合金中的应用前景被引量:5
2012年
综述了残余应力研究现状;分析了残余应力产生的原因;总结了残余应力的各种测试手段和消除方法,并比较了它们的优缺点;展望了镁合金中残余应力的研究和发展方向。
廖洪彬李兴刚马鸣龙李永军石国梁张奎张凤岗曹忠王强黎朝晖
关键词:镁合金残余应力应力测量应力消除
Effects of isothermal homogenization on microstructure evolution of Mg-7Gd-5Y-1MM-0.5Zr alloy被引量:1
2015年
Optical microscopy (OM), scanning electronic microscopy (SEM) and X-ray diffraction (XRD) were performed to inves- tigate the influence of homogenization on the microstructures of the Mg-7Gd-5Y-1MM (Ce-rich RE)-0.5Zr magnesium alloy. The results indicated that α-Mg, Mg24(GdY)5 phase, Mg5(GdY) phase and Mg12MM phase coexisted together in as-cast alloy; the micro- structures were largely characterized by α-Mg matrix and gray globular or elliptic ball Mg12MM phase, in addition to those with cubic block Mg24(GdY)5 phase after homogenization; the reasonable homogenization regime was maintained at 530 ℃ for 32 h.
李蒙李兴刚张奎李永军马鸣龙石国梁袁家伟刘靖宝
关键词:MAGNESIUM
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