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在金属型模具中分别铸造Cu-Al-Fe-Be合金和Cu-Al-Fe-Ni合金,并在多种固溶时效制度下对两种合金进行强化处理。对铸态及各热处理态合金的组织结构及综合力学性能进行对比研究。采用DQ-630(QJ-57)电桥设备和MMW-1型销-盘式摩擦磨损试验机分别对合金电导率变化规律及其摩擦磨损行为进行研究。结果表明,从"高强中导"的角度出发,Cu-Al-Fe-Be铝青铜理想的热处理工艺为950℃×2h淬火,然后经350℃×2 h后水冷时效;Cu-Al-Fe-Ni合金理想的热处理强化工艺为950℃×2 h淬火,然后经450℃×2 h后水冷时效。合金摩擦磨损实验结果表明,铸态合金的磨损主要以磨粒磨损为主;随着热处理的进行和载荷及滑动速度的增加,合金磨损以粘着磨损和氧化磨损为主。此外,Cu-Al-Fe-Be铝青铜在低速低载下的摩擦磨损行为与高速高载下的摩擦磨损行为变化不大,且波动性较小,而Cu-Al-Fe-Ni铝青铜则不然,说明含Be铝青铜的摩擦磨损性能较Ni铝青铜优越。 相似文献
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高强度耐磨铝青铜合金及其摩擦学特性 总被引:18,自引:1,他引:18
在充分考虑铝青铜合金综合性能的基础上,依据铝青铜合金微观组织设计的基本原则,研制了一种新型高强度耐磨铝青铜合金。对这种合金和国内外同类合金的组织、性能进行了比较分析,特别对它们的摩擦学特性进行了深入的探讨。研究结果表明,所研制的新型合金的各项性能明显优于其它同类合金,是一种优良的工程耐磨材料 相似文献
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对Cu-Al-Fe-Be合金和Cu-Al-Fe-Ni合金进行多种制度的固溶时效处理,并对铸态及各热处理态合金的组织结构、综合力学性能及电导率变化规律等进行对比研究.结果表明,固溶时效能够显著改善铝青铜合金的塑性,合金的强度、硬度并没有出现明显的下降,基本保持在淬火后的水平.延长时效时间能够有效提高合金的综合力学性能,但时效时间越长合金的电阻率越大.从“高强中导”的角度出发,Cu-Al-Fe-Be合金理想的热处理工艺为950℃×2h水淬+ 350℃×2h水冷时效:Cu-Al-Fe-Ni合金理想的热处理工艺为950℃×2h水淬+450℃×2h水冷时效.研究结果还表明,较之Cu-Al-Fe-Ni合金,时效处理后Cu-Al-Fe-Be合金具有较好的综合性能. 相似文献
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概述了铸造铝硅合金及合金元素对其组织和性能的影响,介绍了固溶处理、时效处理等热处理工艺的特点、原理及其对铝硅合金组织与性能的影响.指出了现阶段合金元素的调控及热处理存在的不足以及实际应用中存在的问题,同时提出了未来合金元素调控和热处理工艺研究改进的方向. 相似文献
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王荣滨 《有色金属与稀土应用》2006,(2):1-3
铝青铜具有较好的机械物理与化学性能,具有减磨性、无磁性、耐寒性、耐蚀性、冲击时不发生火花、无偏析倾向及良好的铸造、锻造,陛能。单相铝青铜合金具有高的塑性与韧性,其热挤压、锻压加工’陛能优良,但有较大的体积收缩率;双相铝青铜合金有较高硬度、耐磨性与强度,但塑性较低。铝青铜多用于制造航空工业齿轮,选用QA110-4-4或QA111-6—6制造,经优化热处理强化工艺处理后, 相似文献
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研究了热处理对铸态多元铝青铜的微观组织和性能的影响,确定了合金的较佳固溶-时效热处理参数,探讨了合金的强化机理.结果表明,合金经960℃×2 h(水淬)固溶+520℃×3 h(空冷)时效工艺处理后,硬度为40.8 HRC,抗拉强度为608 MPa,冲击韧度为4.8 J/cm~(-2). 相似文献
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提出了一种冷喷涂辅助原位合成高铝青铜合金涂层的方法,使用该方法在45~#钢基体上制备了高铝青铜涂层。通过SEM、EDS、XRD分析涂层微观形貌和物相组织;采用销-盘式摩擦磨损试验机测试涂层的摩擦磨损性能;用CHI660D电化学测试系统测合金涂层耐腐蚀性能。结果表明:冷喷涂辅助原位合成高铝青铜合金涂层的组织是以β相、α相、γ_2相和k相为主的典型高铝青铜合金组织。原位合成的高铝青铜合金涂层结构致密、孔隙率低,具有良好的机械性能和耐磨、耐腐蚀性能,与铸态块体高铝青铜合金的性能接近。涂层的硬度(HV)为3570 MPa,与氧化铝的干摩擦系数为0.320。在3.5%Na Cl和5.0%H_2SO_4(质量分数)腐蚀介质中的稳定电压分别为-366和-387 m V。 相似文献
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通过电偶电流测试和腐蚀形貌观察等方法,研究了5383铝合金分别与907钢和铝青铜组成的两种电偶体系的早期电偶腐蚀平面分布。研究结果发现,两种电偶对中5383铝合金为阳极,907钢和铝青铜则始终为阴极受到保护;5383铝合金的腐蚀形貌有亚稳点蚀、不规则点蚀和类丝状腐蚀;电偶电流随时间变化规律相似,即腐蚀初期电流迅速降低,之后趋于稳定;与偶接点的距离增大,电偶电流降低,且远端的电流分布较为均匀;5383铝合金与907钢偶接时比与铝青铜偶接时大部分区域电流密度更小,但电偶腐蚀更加集中于2 mm内的区域。 相似文献
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为解决青铜衬套压入铝合金阀座后铜铝配套端面的高精密磨削加工难题,实现磨削后达到高精度尺寸误差和形位公差,通过对不同砂轮类型和不同磨削参数、不同磨削刃角度进行对比试验,得出了适用的磨削砂轮、磨削参数和磨削刃角度,实现产品合格率达到95%以上。 相似文献
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B. K. Prasad A. H. Yegneswaran A. K. Patwardhan 《Journal of Materials Engineering and Performance》2000,9(6):688-699
This study analyzes the effects of test temperature and strain rate on the tensile properties of some copper-and zinc-based
alloys. The copper-based alloys comprised a leaded-tin and an aluminum bronze, whereas the zinc-based alloys were added with
various quantities of aluminum. The aluminum bronze attained maximum room-temperature tensile strength, whereas that of the
leaded-tin bronze was the least. Among the zinc-based alloys, the one comprising 27.5 mass% aluminum exhibited superior tensile
strength, followed by those alloyed with 11.5, 37.5, and 47.5 mass% aluminum in a descending order. Increasing strain rate
tended to improve the tensile strength of the alloys. Tensile strength was reduced with an increase in test temperature irrespective
of the alloy composition. The aluminum bronze possessed maximum strength regardless of temperature. The leaded-tin bronze
attained least strength property at low temperatures, whereas higher test temperatures led to superior strength than the zinc-based
alloys. The temperature sensitivity of the strength of the zinc-based alloys decreased with their aluminum content. Tensile
elongation of the alloys tended to increase with an increase in strain rate and test temperature. Leaded-tin bronze was least
affected in either case. The alloy also attained least elongation irrespective of test conditions. The aluminum bronze showed
maximum elongation, at least at high strain rates. In the case of the zinc-based alloys, intermediate range of aluminum concentration
led to better elongation. The elongation property of the alloys was affected by temperature in different manners. In a few
cases, the elongation initially increased followed by a reduction beyond a specific test temperature, whereas, in other cases,
a continuous increase with temperature was noted. The observations made have been discussed in terms of the nature of different
microconstituents of the alloys whose effectiveness changes with test conditions. The response of the samples has been further
substantiated with their fractographic features and subsurface characteristics. 相似文献
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通过形变量为75%的温轧形变热处理,制备了一种超细组织的QAl10-4-4镍铝青铜合金,研究其微观组织与力学性能。结果表明:经大变形温轧后,温轧后的镍铝青铜材料由超细层状(α+β′)双相组织以及细小的k相组成(其中α相为铜基固溶体、β′相为共析相变受阻产生的Cu3Al基马氏体及NiAl析出相、k相为Fe3Al、NiAl等金属间化合物),合金的屈服强度由318 MPa提升至1020 MPa,抗拉强度由784 MPa提升至1104 MPa,具有7.8%的均匀伸长率并呈现良好的应变硬化能力。温轧镍铝青铜合金的高强度主要归因于位错强化、细晶强化以及温轧过程中诱发的纳米析出强化,而良好的塑韧性主要与超细的片层α相和β′相的应力应变协调有关。温轧形变热处理是制备高强韧镍铝青铜合金的一种有效方法。 相似文献
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Morteza Abbasi Reza Derakhshandeh-Haghighi 《The Physics of Metals and Metallography》2018,119(5):497-503
The weldability of aluminum bronze alloys lends it to fabrication of items such as pipes and pressure vessels. Thus, obtaining high strength along with good ductility is necessary. Gas tungsten arc welding of Cu–7Al–3Fe aluminum bronze alloy was performed by variation of some parameters such as shielding gas flow rate, preheat and post weld heat treatment. Optical and scanning electron microscopy along with EDX analysis was applied for different samples. Microhardness measurements and tensile tests were performed to see the effect of these parameters on ultimate tensile strength and ductility of samples. 相似文献
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Taeyong Lee 《Metals and Materials International》2011,17(3):425-430
Reduction of the vibration noise from submarine propellers is of interest in naval operations. Such an objective can be achieved
via the use of materials with the ability to dissipate energy of vibration by means of heat, i.e. high damping materials.
An additional problem is that the extreme hydrostatic pressure environment of a submarine requires the chosen material to
exhibit considerably high stiffness. Most materials demonstrate a compromise between the two properties, i.e. stiffness and
damping. This paper aims to discuss research into high stiffness and high damping materials conducted using a dynamic mechanical
analyzer (DMA) under variations of testing temperature, frequency, and strain amplitude. Alloys of nickel aluminum bronze
and indium tin are the subjects of this study. Defect damping represents a large portion of the overall damping properties
of the nickel aluminum bronze while increasing indium content is shown to boost the damping properties of the indium tin alloy.
The study then continues with the development of a new material that combines both indium alloying and defects introduction
into the nickel aluminum bronze alloy. The new alloy is observed to have high damping, as measured in its high tan δ, with
minimum reduction of the stiffness |E*|. 相似文献
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新型铝青铜及其喷涂层中Ce元素的作用(英文) 总被引:2,自引:0,他引:2
采用一次共装熔炼、砂型铸造Al含量超过Cu-Al二元合金共析点的新型铝青铜合金Cu-14Al-4.5Fe,在45#中碳钢表面制备铝青铜等离子喷涂层。通过扫面电镜、X射线衍射分析、电子探针、透射电镜和显微硬度计分析Ce元素对新型铝青铜合金及喷涂层表面组织形貌和维氏硬度的影响。结果表明:添加0.6%Ce到铸态合金及喷涂层可以使细化的κ相均匀分布于基体,并提高材料硬度。等离子喷涂层快速凝固,保留铝青铜涂层中Fe元素的过饱和固溶体,避免生成(α+γ2)共析相。含Ce喷涂层中的堆垛层错是提高材料力学性能的因素。 相似文献