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Wu Nianqiang Wu Jinming Lin Shuo Zhou Jinqi Li Zhizhang Department of Materials Science Engineering Zhejiang University Hangzhou P. R. China 《中国有色金属学会会刊》1998,(3)
1INTRODUCTIONDuringdryslidingofthealuminumaloysandaluminummatrixcompositesagainststeels,thereexisttwodistinctwearregimes,i.e.... 相似文献
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《Intermetallics》2013
Metastable ThFe2Al10 ternary aluminide was observed in the as-cast Al-6.1at.%Th-6.1at.%Fe alloy. It crystallizes into an orthorhombic structure belonging to Pmmn space group symmetry and possesses unit cell with parameters a = 9.076 Å, b = 8.998 Å and c = 5.031 Å.The ThFe2Al10 (Pmmn) phase can be considered as a metastable state of the equilibrium ThFe2Al10 (Cmcm) compound; its formation should be directly related to the cooling rate of the alloy during casting. After annealing the as-cast alloy at 600 °C for one week the metastable ThFe2Al10 (Pmmn) phase decomposes: the particles of this phase are no longer observed in SEM, and the diffraction peaks associated with this phase disappear in the XRD pattern. 相似文献
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Nd60Al10Fe20Co10金属玻璃的变形行为 总被引:2,自引:0,他引:2
利用材料测试系统(MTS)、X-Ray衍射(XRD)和扫描电镜(SEM)等手段研究了Nd基大块金属玻璃的变形行为和断裂特征.Nd基大块金属玻璃样品在室温下是脆性断裂,大约在500 K时变形模式从非均匀变形转变为均匀变形,在523 K以上表现出显著的塑性变形.在5×10-4 m/s的应变速率下,这种Nd基大块金属玻璃材料在523 K~600 K之间出现明显的屈服应力下降现象,随后进入1种稳定的粘性流动状态,而且这种屈服下降现象与温度和应变速率有关.这种在过冷液相区的变形行为与其他大块金属玻璃变形特征相似.合金的这种塑性变形行为表明了其存在稳定的过冷液相区,同时对其变形行为的研究有助于进一步了解Nd基大块金属玻璃的反常热稳定性. 相似文献
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研究两种不同成分具有较大过冷液相区的四元合金Zr65Al7.5Ni10Cu17.5和Zr65Al10Ni10Cu15,非晶和晶态薄带吸氢行为,结果表qt两种薄带的吸氢量均随着温度的升高而增大,非晶薄带的吸氢量要小于同等条件下的晶态薄带的吸氢量且只有在673K吸氢后形成了氢化物,Zr65Al7.5Ni10Cu17.5非晶和晶态薄带吸氢后分别生成了Zr2NiH4.7和ZrH2;而Zr65Al10Ni10Cu15非晶和晶态两种薄带最后生成的氢化物同为ZrH2。 相似文献
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Nd_(60)Al_(15)Cu_(10)Co_(10)Fe_5大块非晶态合金的制备 总被引:1,自引:0,他引:1
采用铜模浇铸法制得直径4.0mm、长60mm圆柱状Nd60Al15Cu10Co10Fe5大块非晶样品。样品的非晶性经X射线衍射(XRD)实验检验证实。采用示差扫描热分析(DSC)、X射线衍射分析了非晶合金的晶化过程。Nd60Al15Cu10Co10Fe5非晶态合金的约化玻璃温度Trg=0.60,说明合金有较好的非晶形成能力。采用Kissinger方法求得非晶态合金的表观晶化激活能。根据熔化焓对Nd60Al15Cu10Co10Fe5合金深过冷液相与稳定晶相间的吉布斯自由能差进行了估算。结果表明,Nd60Al15Cu10Co10Fe5合金深过冷液相与稳定晶相间的吉布斯自由能差,ΔG,在过冷液相区小于2kJ/mol,表明过冷液相的晶化驱动力很小,过冷液相区内的晶相形核具有较大的热垒。 相似文献
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利用立式高频感应炉制备出3组不同B含量的铸造Pb-Mg-10Al合金,并对其摩擦磨损性能进行了研究.采用X射线衍射仪分析物相,用扫描电镜观察其显微组织.结果表明,随着B的添加,合金组织中出现了陶瓷相AlB2颗粒,由于陶瓷相的增多,合金的硬度得到显著提高.室温滑动摩擦磨损试验表明,合金的耐磨性能随B含量的增加而增加,当B含量为2%时,其磨损量和摩擦因数最小. 相似文献
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Wu Nianqiang Wang Guangxin Li Zhizhang Department of Materials Science Engineering Zhejiang University Hangzhou 《中国有色金属学会会刊》1997,(1)
OXIDATIONOFPMALLOYAl10TiDURINGSLIDINGWEAR①WuNianqiang,WangGuangxin,LiZhizhangDepartmentofMaterialsScienceandEngineering,Zhej... 相似文献
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Coarsening of a dendritic Al–10 wt.% Cu alloy at 570 °C was investigated by fast in situ X-ray tomography. The variation of the specific solid–liquid interface area as a function of time was found to follow a power-law relation with an exponent close to ?1/4. Three coarsening mechanisms operate in the alloy: (i) melting of small dendrite arms to the benefit of the adjacent arms (small arm melting), similar to Ostwald ripening; (ii) gradual movement of the base of the interdendritic grooves towards the tips (interdendritic groove advancement); (iii) coalescence of dendrites near the tips leading to the entrapment of liquid tubes or droplets (coalescence and groove advancement). The coarsening models proposed in the literature do not adequately resemble or predict the behaviour observed in the experiments. New models were developed for the first two coarsening mechanisms and predict the coarsening rate with very good agreement. 相似文献
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研究了Cu-60Ni-10Al和Cu-60Ni-15Al(at%)在800℃的氧化行为。2种合金在初始阶段氧化较快,但与相应的Cu-Ni二元合金相比,铝的存在使合金的氧化速率大为降低;随着完整的保护性Al2O3层形成,合金的氧化速率进一步降低。氧化24h后,Cu-60Ni-10Al氧化膜外层仍有铜镍氧化物存在,10at%Al不足以使合金得到完全保护;而Cu-60Ni-15Al氧化膜完全由Al2O3层组成。对于60at%Ni的Cu-Ni-Al三元合金,获得完全保护的最佳铝浓度在10at%~15at%之间。 相似文献
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CHEN Guo feng 《中国有色金属学会会刊》2000,(3)
1 INTRODUCTIONNanocrystallinecoatingscouldbeproducedbymagnetronsputtertechniqueonthesubstratesofthesamematerialsandexhibitedgoodoxidationresistanceresultedfromthepromotionoftheselectiveoxidationofAlandtheformationofaunitarylayerofAl2O3evenwithlowAlcon… 相似文献
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非晶合金已广泛用于电源铁芯、磁头、各种传感器、电力变压器以及磁屏蔽等许多领域中。近年来又发现了许多过冷液相区很宽的非晶合金,这些非晶合金的临界冷却速度小,有可能制得尺寸较大的非晶合金,可望作为新型工业材料获得广泛应用。这些合金的特征是自玻璃转变温度(Tg)到晶化温度(Tx)的范围内熔体粘度显著降低,随着粘度的变化其它物性也会发生很大变化。当今所使用的贮氢合金几乎都是晶态金属合金,然而晶态贮氢合金经过反复的吸放氢循环之后往往发生微粉化问题,如果制成非晶态贮氢合金这种微粉化问题就可得到缓解。但是,随着贮氢合金… 相似文献
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利用XDTM 法与搅拌铸造技术相结合的工艺制备了TiCp/Zn 10Al(% )复合材料 ,采用定向凝固技术研究增强粒子TiCp 在凝固界面的行为及对复合材料凝固速度的影响。结果表明 :TiC颗粒被凝固的界面前沿所排斥 ,造成界面前沿TiC颗粒富集 ,但当TiC颗粒含量超过 6 %后 ,富集现象已不显著。同时发现随着TiC颗粒含量的增加 ,复合材料的凝固速度降低。 相似文献
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纳米晶Al88Ce2Ni10铝合金的形成 总被引:3,自引:0,他引:3
通过晶化法,可以将快凝Al88Ce2Ni10非晶铝合金制备成纳米晶合金。纳米晶合金的组织为αAl固溶体和金属间化合物Al3Ni及Al11Ce3组成的多相纳米晶结构。在603~773K较宽退火温区内,用Scherer公式计算各晶化相,得到αAl、Al3Ni及Al11Ce3的晶粒尺寸分别为31~316、22~207及19~165nm。结果表明,通过控制热处理条件,可以获得不同晶粒尺寸的纳米晶合金。其中获得晶粒细小、结构均匀超细纳米晶合金的最佳退火温度为第二DSC峰值温度附近 相似文献
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1 INTRODUCTIONThedevelopmentofglassforming multicompo nentalloysystemswithverylowcriticalcoolingrateswithin 1~ 10 0K/shasofferedfirst 相似文献
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《Intermetallics》2006,14(4):377-381
The Zr65Al10Ni10Cu15 alloy sheet produced by squeeze copper-mold casting method exhibited excellent superplasticity (a maximum elongation of 1350%) at a relatively high strain rate (2×10–2s–1) at 696 K. This achievement was made despite the occurrence of crystallization in the middle of deformation. Time for the onset of strain hardening could be related to the T.T.T. diagram for crystallization. Effect of holding time on flow stress was examined. As the holding time was longer, strain hardening took place earlier and the resulted fracture strain was smaller. Bulging test showed that the Zr65Al10Ni10Cu15 alloy sheet could be deformed to near-net-shape by avoiding crystallization when fast heating rate and short holding time were applied. 相似文献
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F. A. Crossley W. F. Carew 《JOM Journal of the Minerals, Metals and Materials Society》1957,9(1):43-46
Ti-Al binary alloys in the range from 6 to 10 pct Al have been found to become embrittled due to the occurrence of a second phase. The degree of embrittlement appears to depend upon the following factors: aluminum content, aging temperature and time, rate of deformation, and testing temperature. Debye powder pattern lines for the second phase are in agreement with the Ti2-Al phase reported by Ence and Margolin. 相似文献