共查询到20条相似文献,搜索用时 15 毫秒
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Yamanoglu Ridvan Bahador Abdollah Kondoh Katsuyoshi Gumus Serap Gokce Sinan Muratal Onur 《Powder Metallurgy and Metal Ceramics》2021,60(3-4):216-224
Powder Metallurgy and Metal Ceramics - Although magnesium is one of the materials with the lowest density, its application is limited amongst other commercial materials due to insufficient... 相似文献
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Arun Boby U. T. S. Pillai B. C. Pai 《Transactions of the Indian Institute of Metals》2013,66(2):105-108
The purpose of this study is to investigate the effect of varying Pb additions on the precipitation sequence of the as-cast and aged AZ91 alloy. The amount of discontinuous precipitate gets reduced by increasing the Pb addition. The phase fraction of as-cast and aged alloys demonstrates that by Pb addition Mg17Al12 phase is reduced to 37.7 and 38.7 % respectively. 相似文献
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Joseph D. Robson Nicole Stanford Matthew R. Barnett 《Metallurgical and Materials Transactions A》2013,44(7):2984-2995
Asymmetric yield behavior in tension and compression is a common and usually undesirable feature of wrought magnesium alloys. To prevent yield asymmetry, it is necessary to favor slip over twinning, as it is the unidirectional nature of twinning combined with the strong textures produced in wrought magnesium alloys that produce yield asymmetry. In this article, the potential to use precipitates to strengthen selectively against twin growth is discussed. The effect of precipitate's shape and habit on strengthening of slip and twinning is calculated using simple Orowan-based models. It is shown that basal plate precipitates, although being poor strengtheners against basal slip, are good strengtheners against twin growth. This is because they produce the maximum unrelaxed back-stress when they remain unsheared inside the twin. The predictions of the model have been validated against experiments for two alloys that form different precipitate types: AZ91 (basal plates). and Z5 (c-axis rods). Crystal plasticity modeling has been used to predict that an optimized distribution of basal plate precipitates is expected to strongly reduce yield asymmetry, even in strongly textured magnesium alloy. 相似文献
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Zhang Yuxiu Chen Tao Kuang Jie Huo Qinghuan 《Metallurgical and Materials Transactions A》2022,53(3):747-753
Metallurgical and Materials Transactions A - This work investigated the compressive creep behavior of a hot-extruded Mg–6Al–1Zn alloy rod in relation to its work hardening capacity. The... 相似文献
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钴基高温合金GH188中镧化物类型及元素Mg晶界偏聚的研究 总被引:2,自引:1,他引:1
使用俄歇电子谱仪(AES)、透射电镜结合能谱仪(EDAX)及扫描电镜等分析仪器,研究了用双真空(真空感应熔炼+真空自耗重熔)工艺生产的钴基高温合金GH188中稀土镧化物的析出形貌与类型以及添加的微量元素Mg晶界偏聚的特性。研究结果表明,采用双真空工艺重熔后,合金中的镧化物呈不均匀分布,导致以它为形核点析出的部分碳化物也分布不均,使其弥散强化效果变差。该合金中的镧化物主要有La2O3,La2O2S,LaOS2,La2S3等类型。另外,微量元素Mg在合金中的晶界偏聚较为明显,这将降低合金的热加工性。因此,GH188合金中应限制元素Mg的含量或不加Mg 相似文献
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Zhou Bijin Wang Leyun Liu Wenjun Zeng Xiaoqin Li Yanjun 《Metallurgical and Materials Transactions A》2020,51(9):4414-4421
Metallurgical and Materials Transactions A - A method was proposed in this study to reveal the subsurface basal dislocation activity in Mg-Y alloy and determine the corresponding Burgers vector.... 相似文献
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Warm-temperature tensile ductility in Al−Mg alloys 总被引:1,自引:0,他引:1
Eric M. Taleff Gregory A. Henshall T. G. Nieh Donald R. Lesuer Jeffrey Wadsworth 《Metallurgical and Materials Transactions A》1998,29(13):1081-1091
Several binary and ternary Al alloys containing from 2.8 to 5.5 wt pct Mg were tested in tension at elevated temperatures
(200°C to 500°C) over a range of strain rates (10−4 to 2.0 s−1). Tensile ductilities of up to 325 pct were obtained in binary Al−Mg alloys with coarse grains deformed in the solute-drag
creep regime. Under test conditions in which solute-drag creep controls deformation, Mg in concentrations from 2.8 to 5.5
wt pct neither affects tensile ductility nor influences strain-rate sensitivity or flow stress significantly. Strength is
shown to increase with increasing Mg concentration, however, in the power-law-break down regime. The solute-drag creep process,
which leads to superplastic-like elongations, is shown to have no observable grain-size dependence in a binary Al−Mg material.
Ternary alloying additions of Mn and Zr are shown to decrease the strain-rate sensitivity during solute-drag creep, negatively
influencing ductility. An important cause of reduced ductility in the ternary alloys during creep deformation is found to
be a transition from necking-controlled failure in the binary alloys to cavitation-controlled failure in the ternary alloys
investigated. An increase in ternary element concentration, which can increase the relative volume percentage of proeutectic
products, increases cavitation. 相似文献
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Qiu Caihao Su Yishi Yang Jingyu Chen Boyang Kong Lingti Ouyang Qiubao Zhang Di 《Metallurgical and Materials Transactions A》2022,53(4):1308-1321
Metallurgical and Materials Transactions A - Precipitates including Al3Li, Al3Zr and core–shell structured Al3Li (Al3Zr) produce significant strengthening effects in Al-Li alloys by means of... 相似文献
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Auger and electron diffraction studies of Al2O3 isolated from a composite prepared by introducing fibers into a vigorously agitated Al−Mg melt indicated the presence of
MgAl2O4 on the fiber surface. The evidence suggested that the spinel was present as discrete crystals. The thickness and coverage
of the spinel is likely to vary with processing conditions.
R. MEHRABIAN formerly with the University of Illinois 相似文献
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K. Brown 《Metallurgical and Materials Transactions B》1971,2(11):2983-2989
A number of new textures have been observed in rolled and annealed magnesium-bearing aluminum alloys. The textures contain
various proportions of {100} <013> or {100} <015> oriented material, together with components near {110} <332>, or {2, 13,
15} <13, 10, 11> or {4, 11, 14} <11, 6, 8>. They result from recrystallization, and involve the migration of high-angle boundaries
similar to those associated with the formation of the more commonly observed cube texture. The origin of these textures is
explained in terms of current theories of recrystallization texture formation, and their occurrence is attributed to the absence
of {358} <835> and {110} <112> components in the rolling texture. This in turn is attributed to preferred orientations in
the as-cast starting material prior to rolling. 相似文献
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以承钢现场渣为基准,研究了钛、镁、铝对炉渣黏度、熔化性温度和脱硫的影响。研究结果表明:在Ca OAl2O3-Si O2-Mg O-Ti O2五元渣系中,钛、镁、铝对炉渣性能的影响较大。随着Mg O质量分数增加,熔化性温度先降低后升高,黏度呈降低趋势,脱硫能力先升高后降低;随着Al2O3质量分数的增加,熔化性温度先降低后升高,黏度变化复杂,脱硫能力降低;随着Ti O2质量分数的增加,熔化性温度和黏度呈升高趋势,而脱硫能力降低。当炉渣碱度为1.12时,炉渣适宜成分:Mg O质量分数约为13.95%,Al2O3质量分数约为13.75%,Ti O2质量分数控制在10.57%以下。合理控制炉渣中钛、镁、铝的配比,对改善炉渣性能和提高高炉生产有重要意义。 相似文献