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Cu—Al粉末烧结合金内氧化后的组织与性能 总被引:4,自引:0,他引:4
通过测定内氧化强化型Cu-Al合金的电阻率,耐蚀,耐磨,抗压性能及SEM,TEM形貌观察,研究了内氧化对合金组织与性能的影响。结果表明:内氧化层中,内氧化物沿晶界呈网状生长,晶内是Cu基体加弥散分布的氧化物质点,内氧化使基体Al原子的固溶量减少,降低了合金的电阻率,增加了合金的致密度及弥散强化强果,因而使5%Al-Cu粉末烧结合金的耐蚀,耐磨及抗压性能明显提高。 相似文献
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采用快速末冶金法(RS/PM)制备Al-Li-Mg-Cu-Zr合金(合金经固溶时效处理)。测试了合金的拉伸性能,并借助于SEM、TEM探明了该合金的时效强化机理。 相似文献
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稀土对高强Al—Zn—Mg—Cu合金耐蚀性能的影响 总被引:4,自引:0,他引:4
采用化学失重法,考察了稀土对Al-Zn-Mg-Cu高强铝合金耐蚀性能的影响,研究结果表明,在不同介质中,加稀土的Al-Zn-Mg-Cu比Al-Zn-Mg-Cu高强铝合金有较高的耐腐蚀性能,在还原性介质中的耐腐蚀更好,稀土含量控制在0.05%为宜。 相似文献
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对水雾化Cu-Al合金粉末进行内氧化处理,经x射线分析和电子显微镜观察,确认得到v-Al2O3,粒子的平均尺寸为150A,形状为长圆形,在基体中分布均匀。Cu-Al2O3粉末经等静压压坯,烧结挤压后组织均匀致密,各项物理、力学性能得到大幅度提高,冷加工性良好,是制造Cu-Al2O3复合材料的好方法。 相似文献
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LC19铝合金是我国自行研制的一种新型铝合金。它是在可热处理强化的Al-Zn-Mg系合金中添加了微量元素Cu、Cr、Mn和Zr,具有中强可焊耐蚀等良好的综合性能,广泛用于海洋舰船、车辆和桥梁等工程。本文分析了合金的元素组成、模锻变形、热处理以及它们对合金的组织性能特别是抗应力腐蚀性能的影响,为制定大生产的工艺提供可靠的依据。 相似文献
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采用新型的喷射沉积技术制备Al-3.8Li-0.8Mg-0.4Cu-0.13Zr(No.1)和Al~2.15Li-1.28Cu-1.26Mg-0.1Zr(No.2)合金,对合金在时效过程中的析出相进行了比较和分析。实验结果表明,喷射沉积快速凝固Al-Li合金的δ'相粒子与铸锭冶金法Al-Li合金的δ'粒子有较大差异.高Li低Cu含量的No.1合金δ'相的体积分数明显高于低Li高Cu含量的No.2合金,δ'相的粗化速率较大,但仍然符合Ostwarld粗化规律;长时间的时效处理使δ等平衡相在晶内或晶界析出,导致晶界无析出区的形成和宽化。 相似文献
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采用新型的喷射沉积技术制备了Al-3.8Li-0.8Mg-0.4Cu-0.13Zr(No.1)和Al-2.15Li-1.28Cu-1.26Mg-0.1Zr(No.2)合金,对合金在时效过程中的析出相进行了比较和分析,实验结果表明,喷射沉积快速凝固Al-Li合金的δ相粒子与铸锭冶金法Al-Li合金的δ粒子有较大差异,高Li低Cu含量的No.1合金δ相的体积分数明显高于低Li高Cu含量的No.2合金, 相似文献
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激光熔覆作为一种绿色、高效的表面处理技术,能够快速制备组织致密、晶粒细小,与基体呈高强度冶金
结合的涂层,是近年来高熵合金领域的研究热点之一。概述了现有高熵合金涂层材料体系和制备方法,重点讨论
了激光熔覆CoCrFeNi-M 典型过渡族高熵合金涂层的组织结构,及其耐磨、耐蚀、抗高温氧化等性能,并归纳了
涂层的强化机制和方法。CoCrFeNi-M 系合金涂层主要呈现FCC 固溶体结构,综合力学性能普遍较好,通过合金
体系调控,在细晶强化、固溶强化、第二相强化等作用下,能够获得硬度、耐磨性、耐蚀性等性能的进一步提升。
同时,概述了激光熔覆难熔高熵合金涂层的组织结构,耐磨、耐蚀、抗高温氧化性能及性能强化机制,该体系合
金涂层主要呈现BCC 固溶体结构,硬度较高但室温韧性普遍不足,具有较好的高温强度,在高温领域具有较好
的应用前景,但抗高温氧化性能普遍不足,仍需通过合金体系优化进一步提升。此外,总结了基于激光熔覆技术
开展的高熵合金涂层制备及研究中存在的问题和不足,并展望了未来的发展方向。 相似文献
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为了在钛合金表面制备耐磨性能良好的复合微弧氧化膜层,研究了4种不同类型的表面活性剂对复合六方氮化硼(hBN)固体润滑微粒微弧氧化膜层微观结构及其耐磨性能的影响。结果表明,表面活性剂对复合微弧氧化(MAO)膜层的微观结构和耐磨性能有明显的影响,阳离子型表面活性剂十六烷基三甲基溴化铵降低了复合MAO膜层中h BN微粒含量,削弱了膜基结合,因而不利于膜层耐磨性能的改善;非离子型表面活性剂无水乙醇由于挥发性强导致膜层的致密性下降,降低了膜层的耐磨性能;阴离子型表面活性剂十二烷基苯磺酸钠对复合MAO膜层的结构和耐磨性能影响较小;阴离子型表面活性剂羧甲基纤维素钠则有效改善了hBN微粒在电解液中的分散性,进而改善其在MAO膜层中的复合及分布状况,从而明显改进了复合MAO膜层的耐磨性能。 相似文献
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Akindofdirectionallysolidifiedalloy,IC6,withthechemicalcompositionofNi(75~85)Al(130~150)Mo(002~01)B(%,massfraction)hasbeenrecentlydevelopedasoneofthehightemperaturestructuralmaterialsusedforadvancedjetenginebladesandvanesoperatinginthetemperaturerangeof1050~1150℃[1].The… 相似文献
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铝合金具有低密度、高比强度、较好的耐蚀性等优点,被广泛应用于航空、船舶和汽车等领域;选区激
光熔化成形可以一次性成形复杂零件,具有良好的应用前景。对选区激光熔化(SLM)成形的Al-Cu-Mg 合金
摩擦磨损性能进行了研究,并与成分相近的铸造ZL205A合金性能进行对比,结果表明,采用SLM工艺成形可
细化合金晶粒,改变Al2Cu 的尺寸与分布,使晶粒细小均匀。与铸造ZL205A合金相比,SLM成形Al-Cu-Mg
合金的磨损率和摩擦因数均有不同幅度的降低。SLM成形Al-Cu-Mg 合金横截面的耐磨性最好,纵截面耐磨
性次之,铸造ZL205A的耐磨性最差。SLM成形Al-Cu-Mg 合金的磨损机制随着载荷的变化而不同:低载荷时
的磨损机制以磨粒磨损为主,粘着磨损和塑性挤出磨损并存;中载荷时的磨损机制为磨粒磨损、粘着磨损并伴
随氧化磨损;高载荷时的磨损机制主要为剥层磨损、粘着磨损和氧化磨损的综合作用。 相似文献
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Two experimental single crystal superalloys Y-free alloy and Y-containing alloy were cast in the directionally solidified furnace, while other alloying element contents were basically kept unchanged. T... 相似文献
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G. Madhusudhan Reddy A. Sambasiva Rao K. Srinivasa Rao 《Transactions of the Indian Institute of Metals》2013,66(1):13-24
Present work pertains to surface modification of the magnesium alloy using friction stir processing (FSP). Silicon carbide and boron carbide powders are used in the friction stir processing of the ZM21 Magnesium alloy. Coating was formed by FSP of the alloy by placing the carbide powders into the holes made on the surface. Surface coating was characterized by metallography, hardness and pin-on-disc testing. Friction stir processed coating exhibited excellent wear resistance and is attributed to grain boundary pinning and dispersion hardening caused by carbide particles. Surface composite coating with boron carbide was found to possess better wear resistance than coating made with silicon carbide. This may be attributed to formation of very hard layer coating of boron carbide reinforced composite on the surface of magnesium alloy. In the present work an attempt has also been made to compare the wear behaviour of surface composite layer on ZM21 Mg alloy with that of conventionally used engineering materials such as mild steel and austenitic stainless steel. Wear data clearly shows that wear resistance of friction stir processed composite layer is better than that of mild steel and stainless steel. This work demonstrates that friction stir processing is an effective strategy for enhancement of wear resistance of magnesium alloys. 相似文献
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The cyclic oxidation behavior of a fine-grained, rapidly solidified 303 stainless steel was determined at 900 °C in pure oxygen.
The rapidly solidified alloy exhibited superior resistance to oxidation compared with that of a wrought 304 stainless steel;
its oxidation resistance was as good as that of a wrought 310 stainless steel, even though the latter alloy contained more
Cr and Ni. The matrix of the rapidly solidified steel contained a uniform dispersion of fine MnS precipitates (0.2 to 0.5
μm), which were effective in inhibiting grain growth at elevated temperatures. The enhanced resistance to oxidation of the
rapidly solidified alloy is attributed to two factors: (1) the formation and growth of protective Cr2O3 and SiO2 scales were promoted by the fine alloy grain size (5 to 8 =gmm) and by the presence of the MnS dispersion, and (2) the adherence
of the scale was increased by the formation of intrusions of SiO2 from the external scale into the alloy, which formed around MnS precipitates and along closely-spaced alloy grain boundaries,
and which acted to key the scale mechanically to the alloy. 相似文献