共查询到20条相似文献,搜索用时 62 毫秒
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为了改善锌铝合金线材加工使用性能,依据90°转角挤压原理,采用径向挤压出线工艺制取线材,研究了线材拉拔后的微观组织和力学性能,并与轴向挤压出线工艺进行对比.结果表明,径向挤压出线工艺可明显细化合金组织,且有纤维化倾向.线材抗拉强度降低15%,而伸长率提高30%.该工艺有利于线坯的拉拔加工,减少喷枪送丝途中的阻力. 相似文献
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研究了挤压压力和Ti、B含量对ZnAl27Cu2合金组织和性能的影响.结果表明随着压力的增加,ZnAl27Cu2合金组织不断细化,强度、硬度和伸长率也相应得到提高;随着Ti、B含量的增加,合金组织和力学性能在得到一定改善后又逐渐恶化. 相似文献
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挤压变形程度对2A50合金组织性能的影响 总被引:1,自引:3,他引:1
通过试验的方法在不同变形程度等条件下对2A50合金进行性能测试和金相分析,结果表明经过挤压变形后,2A50合金晶粒被细化,纵向组织被拉长,铸造缺陷改善,力学性能提高。 相似文献
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采用挤压铸造和重力铸造制备出不同混合稀土含量的ZL305合金,研究了混合稀土含量和挤压铸造对合金微观组织和力学性能的影响。结果表明,在重力铸造下,添加混合稀土对合金晶粒细化效果明显,当添加0.1%的混合稀土时,ZL305合金的综合力学性能达到最佳,抗拉强度增加到227.88MPa,伸长率为6.47%。相比重力铸造,挤压铸造成形的合金组织明显细化,并且合金铸态的抗拉强度和伸长率都明显提高。添加0.2%的混合稀土时,合金的抗拉强度和伸长率最佳,分别为302.35MPa和7.23%。经430℃×10h固溶处理后挤压铸造合金的性能显著提高。 相似文献
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锰对5056合金热挤压管材组织性能的影响 总被引:1,自引:0,他引:1
研究锰含量对5056铝合金热挤压状态管材组织和力学性能的影响。结果表明,由于5056合金中锰元素的含量少,对再结晶的抑制作用弱,使得挤出的管材组织发生了完生再结晶,从而使其力学性能与退火状态的基本相同,这就为在冷加工时,充分发挥合金的塑性,减少加工道次和退火次数,合理制定冷加工工艺提供了依据。 相似文献
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研究了挤压铸造过程中挤压压力对ZL109过共晶铝合金组织和性能的影响。试验选择在200 t液压机上进行挤压铸造,设计挤压压力为75 MPa、95 MPa、115 MPa进行评估。结果表明,挤压铸造工艺改善了铸件组织,提高了合金的力学性能。挤压压力的变化对合金的初生Si、共晶组织的尺寸、体积分数和力学性能影响显著。在试验范围内,挤压压力为115 MPa下的初生Si颗粒直径相较于75 MPa与95 MPa分别减小了23.5%和28.4%、共晶Si的平均尺寸分别减少了22.1%和50.3%;α-Al的尺寸分别降低了13.6%和18.3%;挤压压力从75 MPa增加到95 MPa,合金的抗拉强度、屈服强度、伸长率和硬度分别提高13.9%、22.6%、19.9%和9.4%;压力从95 MPa提高到115 MPa,抗拉强度和伸长率分别降低2.4%和6.6%。 相似文献
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Extrusion treatment is a common method to refine the grain size and improve the mechanical properties of metal material. The influence of hot extrusion on microstructure and mechanical properties of AZ31 magnesium alloy was investigated. The results ,show that the mechanical properties of AZ31 alloy are obviously improved by extrusion treatment. The ultimate tensile strength (UTS) of AZ31 alloy at room temperature is measured to be 222 MPa, and is enhanced to 265.8 MPa after extrusion at 420℃. The yield tensile strength (YTS) of AZ31 alloy at room temperature is measured to be 84 MPa, and is enhanced to 201 MPa after extrusion at 420℃. The effective improvements on mechanical properties result from the formation of the finer grains during extrusion and the finer particles precipitated by age treatment. The features of the microstructure evolution during hot extruded of AZ31 alloy are dislocation slipping on the matrix and occurrence of the dynamic recrystallization. 相似文献
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《塑性工程学报》2016,(5):23-28
采用数值模拟与工艺实验相结合,研究了挤压轮转速对铝锶合金连续挤压成形过程和产品组织性能的影响。通过数值模拟分析了不同转速下坯料的温度、速度和等效应变分布情况以及模具的温度分布规律并利用金相观察和拉伸试验分析了不同转速下实际连续挤压产品的组织性能。结果表明,铝锶合金在连续挤压过程中,坯料进入腔体后,温度开始升高,最高温度和最大速度出现在模具出口处;最大等效应变出现在直角弯曲处。当挤压轮转速由4r·min~(-1)增加到7r·min~(-1)时,腔体内的坯料最高温度由460℃升高到514℃,模具出口处的温度由490℃升高到527℃;产品中Al4Sr相形态由块状变成颗粒状,尺寸减小;抗拉强度由98.7MPa上升到106.9MPa,伸长率变化不大,维持在约11%。 相似文献
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研究了挤压工艺参数(挤压温度、挤压比)对Mg-Sr-Y中间合金组织和性能的影响。结果表明:Mg-Sr-Y中间合金的铸态组织是由树枝晶状的基体相α-Mg、沿晶分布的网状共晶组织(Mg17Sr2+Mg25Y4)组成;热挤压后合金的晶粒明显细化,树枝晶和网状组织被打碎,晶粒大小和合金中析出相的分布更均匀。同时挤压后合金的硬度显著提高,力学性能明显改善,形变强化效果较为显著,其强化效果与挤压温度和挤压比有关。挤压温度越高,挤压比越大,则强化效果越显著。 相似文献
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The microstructure and mechanical properties of as-cast and as-extruded Mg-Zn-Y alloy (Mg-11 %Zn- 0.9%Y, mass fraction) containing Mg3 YZn6 quasicrystal were studied. The eutectic icosahedral quasicrystal phase (I-phase) is broken and almost distributes along the extrusion direction, and fine I-phase with nano-size is precipitated during the extrusion. The a-Mg matrix grains are refined due to recrystallization occuring during the hot extrusion. Some {1012} twins are observed in the extruded ZW1101 alloy. And {0002}(1010) fiber texture is formed in matrix alloys after hot extrusion. The extruded alloy exhibits high strength in combination with large elongation at room temperature. The strengthening mechanism of the as-extruded alloy was discussed. 相似文献
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Influence of ultrasonic melt treatment on microstructure and mechanical properties of AlSi9Cu3 alloy
H. PugaS. Costa J. Barbosa S. RibeiroM. Prokic 《Journal of Materials Processing Technology》2011,211(11):1729-1735
A novel MMM (Multi-frequency, Multimode, Modulated) ultrasonic (US) technology was used to refine the as cast microstructure and improve the mechanical properties of a AlSi9Cu3 alloy. Ultrasonic vibration was isothermally applied to the melt for 120 s at different temperatures slightly above the liquidus temperature of the alloy, using different electric power values, before pouring into a metallic mould. The microstructure of the cast samples was characterized by optical and scanning electron microscopy and energy dispersive spectrometry. Ultrasonic vibration promoted the formation of small α-Al globular grains, changed the size and morphology of intermetallic compounds and distributed them uniformly throughout the castings. Ultimate tensile strength and strain were increased to 332 MPa and 2.9%, respectively, which are 50% and 480% higher than the values obtained for castings produced without vibration. The microstructure morphology and the alloy mechanical properties were found to depend on the electric power and the melt temperature, and by using a suitable combination of these parameters it is possible to achieve high refinement efficiency by treating the melts in the liquid state. 相似文献
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The effect of Cu on the microstructure and mechanical properties of 2519 aluminum alloy was investigated by means of tensile test, microhardness test, transmission electron microscopy, and scanning electron microscopy. The results show that when the content of Cu is less than 6.0%, the strength of 2519 aluminum alloy increases with the increase of Cu eontent; when the content of Cu is more than 6.0%, the strength of the alloy decreases. The hardening effect of the aged alloy is accelerated at 180℃ and the time to peak age is reduced, but the plasticity of the alloy gradually decreases with the increase of Cu content. However, the hardening effect of the aged alloy decreases with the increase of Cu as the content of Cu is over 6.0%. The optimal content of Cu of 2519 aluminum alloy is 6.0%, at which the alloy has best tensile strength and plasticity. 相似文献