硅酸铝短纤维增强Al—12Si合金复合材料的磨损行为

用挤压铸造法制备了低体积分数的硅酸铝短纤维增强Ａｌ－１２Ｓｉ合金复合材料,并利用销盘磨损２试验机研究了材料在干摩擦条件下的磨损行为。     

颗粒增强铝合金叠层复合材料的制备与强度和耐磨性

介绍了ＳｉＣ颗粒增强ＡｌＣｕ合金叠层复合材料的制备方法，研究了叠层复合材料的抗弯强度和增强层的耐磨性与ＳｉＣ颗粒含量的关系。结果表明，ＳｉＣ颗粒体积分数为２０％时该材料的抗弯强度最大，磨损量最小；ＳｉＣ颗粒与基体结合强度及层间宏观应力影响材料的强度性能     

Ti—6Al—4V合金激光表面合金化制备Ti5Si3／Ti耐磨复合材 …

利用预涂Ｓｉ粉对Ｔｉ－６Ａｌ－４Ｖ合金进行激光表面合金化,制得以初和及共晶金属间化合物Ｔｉ５Ｓｉ３为增强相的快速凝固“原位”耐磨磨复合材料表面改性层,研究了激光表面合金化Ｔｉ５Ｓｉ３／β－Ｔｉ耐磨复合材料表面改性层的显微组织及其在干滑动磨损及二体磨料磨损条件下的耐磨性能。结果表明：利用Ｓｉ粉对Ｔｉ－６Ａｌ－４Ｖ合金进行激光表面合金化处理后,合金层硬度及耐磨性大幅度提高。     

颗粒增强名合金叠层复合材料的制备与强度和耐磨性

介绍了ＳｉＣ颗粒增强Ａｌ－Ｃｕ合金叠层复合的制备方法，研究了叠层复合材料的抗弯强增强层的耐磨性与ＳｉＣ颗粒含量的关系。结果表明，ＳｉＣ颗粒体积分数为２０％时该的抗弯强度最大，磨损量最小；ＳｉＣ颗粒与基体结构强度及层间宏观应力影响材料的强度性能。     

颗粒增强铝基复合材料的组织与性能

用熔铸法制备了ＴｉＢ２和ＳｉＣ颗粒增强铝基复合材料,评价了ＴｉＢ２／Ａｌ和ＳｉＣ／Ａｌ复合材料的硬度,研究了增强剂的加入方式和体积分数对ＴｉＢ２／Ａｌ复合材料拉伸性能的影响;并用扫描电镜分析了复合材料的显微组织。结果表明,ＴｉＢ２颗粒对Ａｌ基体的增强效果比ＳｉＣ颗粒好,Ｔｉ,Ｂ化合物的增强效果优于ＴｉＢ２粉末,复合材料的力学性能随ＴｉＢ２体积分数增加而提高;用含Ｔｉ,Ｂ化合物的混合物增强的１．５％ＴｉＢ２／Ａｌ（体积分数）复合材料的热轧退火态性能为σｂ１６０．４ＭＰａ,δ１３．１％,铸态ＨＢ４５１ＭＰａ。ＳＥＭ观察结果表明,在铝基体中添加Ｔｉ、Ｂ化合物的混合物能在基体中原位生成ＴｉＢ２颗粒。     

Al2O3—SiO2系纤维增强ZL109合金复合材料的时效特性

本文研究了Ａｌ２Ｏ３－ＳｉＯ２系纤维增强ＺＬ１０９合金复合材料的时效特性，结果表明：Ａｌ２Ｏ３－ＳｉＯ２系纤维增强ＺＬ１０９合金复合材料具用ＺＬ１０９合金相似的时效硬化曲线及相同的析出相。在时效硬化过程中复合材料始终保持比ＺＬ１０９合金相似的时效硬化曲线及相同的析出相。在时效硬化过程中复合材料始终保持比ＺＬ１０９合金较高的硬度，而且随着时效时间的延长，硬度的下降比ＺＬ１０９合金的缓慢。     

SiCp增强Al基复合材料的真空扩散焊接

采用真空扩散焊接方法研究了同质及异质ＳｉＣｐ增强Ａｌ基复合材料的连接特性,考察了ＳｉＣｐ体积分数变化及插入中间合金层对同质及异质Ａｌ合金基复合材料真空扩散焊接质量及接头性能的影响。研究结果表明,无论同质还是异质Ａｌ合金基复合材料,真空扩散焊接头的强度均随ＳｉＣｐ体积分数的增加而降低;获得满意的异质ＳｉＣｐ增强Ａｌ合金基复合材料的真空扩散焊连接远比同质材料时困难。研究结果还表明,无论同质还是异质Ａｌ     

Al_2O_3－Al－Si合金复合材料的研究

利用铸造搅拌法制取了由Ａｌ２Ｏ３颗粒增强的Ａｌ－Ｓｉ合金复合材料。通过正文试验，探讨了Ａｌ２Ｏ３颗粒的尺寸、颗粒的体积分数与浇注温度对Ａｌ２Ｏ３颗粒－Ａｌ－Ｓｉ复合材料组织和性能的影响。结果表明：当Ａｌ２Ｏ３，颗粒尺寸为１－３ｍ、体积分数１５－２０％，浇注温度为８００℃时增强效果最佳，强度可提高２０％以上，磨损量可减少６０％－７０％，Ａｌ２Ｏ３颗粒能促进Ｓｉ相形核、有碎化共晶硅并使之细化的作用。     

Al-Si合金宏观晶粒的尺寸突变与结构演化

本文研究了Ａｌ－Ｓｉ合金宏观晶粒尺寸与含Ｓｉ量的关系及结构演化规律。结果表明：宏观晶粒尺寸随含Ｓｉ量增加呈峰谷变化。即在３％Ｓｉ（质量分数，下同）左右达到谷底，在共晶点（１２％Ｓｉ）附近达到峰值；未变质共晶Ａｌ－Ｓｉ合金的宏观晶粒尺寸与纯Ａｌ相近。Ａｌ－Ｓｉ合金宏观晶粒的结构随含Ｓｉ量增加发生演化。其演化过程为：单一αａｌ→以α－Ａｌ为中心外围被共晶团环绕→单一共晶团组织→初生Ｓｉ为核心、周围环α     

Al2O3—Al—Si合金复合材料的研究

利用铸造搅拌法制取了由Ａｌ２Ｏ３颗粒增强的Ａｌ－Ｓｉ合金复合材料。通过正交试验，探讨了Ａｌ２Ｏ３颗粒的尺寸、颗粒的体积分数与浇注温度对Ａｌ２Ｏ３颗粒－Ａｌ－Ｓｉ复合材料组织和性能的影响。结果表明：当Ａｌ２Ｏ３颗粒尺寸为１－３ｕｍ、体积分数１５－２０％，浇注温度为８００℃时增强效果最佳，强度可提高２０％以上，磨损量可减少６０％－７０％，Ａｌ２Ｏ３颗粒能促进Ｓｉ相形核，有碎化共晶硅并使之细化的作用。     

Role of Al2O3 fiber in eutectic Al-Si alloy composites

1　ＩＮＴＲＯＤＵＣＴＩＯＮＭｅｔａｌｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓ (ＭＭＣｓ)ｈａｖｅｍａｎｙｉｍｐｏｒｔａｎｔａｐｐｌｉｃａｔｉｏｎｓｉｎａｉｒｃｒａｆｔａｎｄａｕｔｏｍｏｂｉｌｅｉｎ ｄｕｓｔｒｙ ,ｆｏｒｔｈｅｙｈａｖｅｍａｎｙａｄｖａｎｔａｇｅｓｓ     

反应自生氧化铝颗粒增强铝基复合材料

向铸铝ADC12熔体中添加硫酸铝铵,由反应分解的Al2O3原位生成了颗粒增强铝基复合材料。SEM观察表明,Al2O3颗粒在铝基体中细小弥散分布,形成球形、不团聚的增强体颗粒;Al2O3颗粒增强铝基复合材料中的片状共晶硅的数量比未增强合金的少,且Al2O3邻近处的针状共晶硅非常精细。与基材相比,Al2O3颗粒增强铝基复合材料的耐磨性较基材的提高了1~2倍,硬度提高了15%,且由硫酸铝铵反应自生成复合材料的耐磨性优于添加氧化铝形成的复合材料的。     

Characterization of Al-12Si alloy and its composites in dry sliding friction and wear at elevated temperature

1　INTRODUCTIONDiscontinuousreinforcementsreinforcedalu minumalloycomposites(DRACs)havesuperiorwearproperty ,especiallyhighseizureresistanceatelevatedtemperaturecomparedwithcommonaluminumal loys ,whichhavebeenreceivedconsiderableattentionin pasttwodecades[13] .TherearereportsaboutDRACsusedinpistonorblockin Ref.[4 ].Toim provethefrictionandwearpropertiesofaluminiumalloysfurther ,thehybridcompositesrepresentedthemergingoftwophilosophiesintribologicalalloyde sign—hard reinforcementsreinf…     

Superior Tribological Properties of Particulate Aluminum Matrix Nano Composites

Aluminum is the best metal for producing metal matrix composites which are known as one of the most useful and high-tech composites in our world. Combining aluminum and nano Al₂O₃ particles will yield a material with high mechanical properties. Characterization of tribological properties revealed that the presence of nano particles significantly increased wear resistance of the composite. In case of unreinforced Al alloy, the depth of penetration is governed by the hardness of the specimen surface and applied load. But, in case of Al matrix composite, the depth of penetration of the harder asperities of hardened steel disk is primarily governed by the protruded hard ceramic reinforcement. The hard Al₂O₃ particles act as a protrusion over the matrix, carries a major portion of the applied load and protect the abrasives from penetration into the specimen surface.     

Mullite/Al-Mg-Si复合材料时效行为研究

选用挤压铸造法制备Mullitel/Al-Mg-Si复合材料，采用扫描电镜、透射电镜等手段．研究了莫来石短纤维增强不同镁硅比Al-Mg-Si复合材料及其基体合金的时效行为。结果表明：复合材料具有和基体合金相似的时效硬化曲线，相同的析出序列；Mullite纤维的引入提高了基体合金的时效硬度，并一定程度地加速了基体合金的时效硬化过程．但对CP区的抑制不明显；Si或Mg元素的富余都加速了复合材料及其基体合金的时效硬化过程，且两类材料的时效峰明显提前。Mullite短纤维与富余的Si或Mg元素对复合材料的时效硬化过程具有交互促进作用。     

Microstructure evolution of rare earth Pr modified alumina-silicate short fiber-reinforced Al-Si metal matrix composites

Al-Si metal matrix composites (MMCs) reinforced with 20 vol.% alumina-silicate shot fibers (Al2O3-SiO2(sf)) were fabricated by an infiltration squeeze method. Pure Pr metal was added into these composites. The effect of Pr addition on the microstructure evolution of Al-Si MMCs was investigated by SEM,TEM,and EDS. Pr addition is favorable to make uniform microstructures with the modified eutectic Si crystal. PrAlSi phase with high contents of Pr and Si is observed on the interface between the fiber and the m...     

铝基复合材料在交通运输工具中的应用

铝基复合材料在汽车中的应用日益增多。杜拉坎是一种用常规铸锭冶金法生产的以氧化铝粒子增强的铝合金基复合材料,已在国外一些汽车中批量应用。     

摩擦速度对颗粒增强铁基复合材料摩擦性能的影响

研究了颗粒增强铁基复合材料（PRMMCs）在不同摩擦速度下的性能。结果表明，复合材料的摩擦系数随着摩擦速度增加而降低；摩擦速度低时复合材料主要发生剥层磨损，高时则主要发生磨粒三体磨损、粘着磨损和氧化磨损。复合材料比高速钢的磨损系数低两个数量级，具有更低的磨损系数，因此具有良好的耐磨性。     

Dry sliding friction and wear behaviors of TiCp／ZA—12 composites

1　ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｚｉｎｃ ａｌｕｍｉｎｕｍａｌｌｏｙｓｈａｖｅｂｅｅｎｗｉｄｅｌｙｕｓｅｄｉｎｔｈｅｐｒｏｄｕｃｔｉｏｎｏｆｄｉｅａｎｄｂｅａｒｉｎｇｆｏｒｔｈｅｉｒｅｘ ｃｅｌｌｅｎｔｗｅａｒｒｅｓｉｓｔａｎｃｅｐｒｏｐｅｒｔｙ ,ｔｈ     

Tensile and wear properties of rolled Al5Mg-Al<Subscript>2</Subscript>O<Subscript>3</Subscript> or C particulate composites

Al5Mg alloy matrix composites reinforced with different percentages of Al₂O₃ (60 μm) or C (90 μm) particulates were prepared by the vortex method. The composites were then subjected to hot or cold rolling with different reduction ratios. The microstructures of the rolled composites revealed that the matrix grains moved around the particulate causing deformation. By continuing deformation, the particulates rearranged themselves in the matrix, leading to lensoid distortion. It was found that the addition of Al₂O₃ or C particulates increased the 0.2% proof stress and reduced both the tensile strength and ductility, compared with the monolithic alloy. Scanning electron microscopy (SEM) fractographic examinations showed that the composites reinforced with Al₂O₃ particulates failed through particulate fracture and matrix ligament rupture. However, the failure of the composites reinforced with C particulates was through particulate decohesion, followed by ductile failure of the matrix. Abrasive wear results showed that the wear rate of the Al5Mg alloy decreased with the addition of C particulates. However, increasing the volume fraction of C particulates did not have a prominent effect on the wear rate. The composites reinforced with Al₂O₃ particulates exhibited a higher wear rate than that of the unreinforced alloy. Furthermore, addition of both C and Al₂O₃ particulates into the Al5Mg matrix alloy did not significantly improve the wear resistance. For all composites studied in this work, hot or cold rolling had a marginal effect on the wear results.