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with 1.6 nm periodicity as the basic structural building blocks. The two CAPs belong respectively to a decagonal quasicrystal with defects of high density and defective crystalline phase (ε16). Prior...以及各自对应的傅立叶变换谱 Fig.4 HREM image and Fourier transform patterns showing adjoining decagonal quasicrystal (DQC) and M-Al3Fe phases in region B 2.2.2 铸态ε16相的显微结构特征 以上HREM观察及分析结果清楚地揭示了B区内与......
基于氢氧化铝阻燃体系的开级配沥青磨耗层防火面层研究 丁庆军,沈 凡,黄绍龙 (武汉理工大学 材料科学与工程学院,湖北 武汉,430070) 摘 要:基于氢氧化铝(ATH)沥青阻燃体系,通过极限氧指数与闪点温度测试,研究ATH与氢氧化镁(MH)的阻燃性能及Zeolite沸石粉的阻燃促进作用,提出ATH,MH及Zeolite沸石粉的复合阻燃沥青配合设计,利用研究成果制备开级配沥青磨耗层(OGFC)沥青混合料并测试其阻燃,路用性能.研究结果表明:ATH,MH和Zeolite三者按比例复合制备的阻燃沥青极限氧指数可达到29%以上,闪点温度近420 ℃,阻燃......
, the corrosion current density is reduced by two orders of magnitude compared with that of uneroded Mg68Zn32 alloy. Key words: as-cast magnesium alloy; corrosion resistance; icosahedral quasicrystal; Mg-Zn... alloys with icosahedral quasicrystal phase (I-phase)[9-12] were prepared by as-cast method. That is to say, the melted alloys are autogenetic composite materials of magnesium alloys with icosahedral......
and quasiperiodicity of quasicrystal phase ensure a good atomic match at the interface between this quasicrystal phase and the matrix[2]. Therefore, the interfacial energy between the I-phase and matrix is so low.... Electron localization in metallic quasicrystals [J]. Science, 1993, 261: 737-739. [4] SINGH A, NAKAMURA M, WATANABE M, KATO A, TSAI A P. Quasicrystal strengthened Mg-Zn-Y alloys by extrusion [J]. Scripta......
alloy [J]. Materials Letters, 2006, 60: 2190-2193. [4] LUO Z P, ZHANG S Q, TANG Y L, ZhAO D S. Quasicrystal in as-cast Mg-Zn-RE alloys [J]. Scripta Metallurgica et Materialia, 1993, 28(12): 1513-1518..., 2000: 251-258. [6] WAN D Q, YANG G C, ZHU M. Microstructure formation and mechanical property involving icosahedral quasicrystal phase of Y rich Mg-Zn-Y quasicrystal alloy [J]. Acta Metallurgica......
alloy; metal matrix composites; mechanical behavior 1 Introduction Since the quasicrystal was discovered by SCHETHMEN in 1984[1], it attracted more and more interest in its application [2-4.... Development of novel polymer/quasicrystal composite materials[J]. Mater Sci Eng A, 2000, 294/296: 156-159. [7] DUBOIS J M. Introduction to Quasicrystals[M]. Berlin: Springer, 1999. [8] FLEURY E, LEE S M......
, it is believed by PETROV [6] that there is quasicrystal phase (q), not τ intermetallic compound in equilibrium with the α-Mg solid solution at 335 °C except for these compounds mentioned above, according to the results of TAKEUCHI and MIZUTANI [7]. The quasicrystal phase is stable in the Al15Mg44Zn41 alloy held at 360 °C for 5 h or heated from room temperature to 380 °C by means of differential scanning......
quasicrystal; mechanical properties; intermetallics  ... quasicrystal [J]. Scripta Mater, 1999, 41: 989-994. [10] TSAI A P, AOKI K, INOUE A, MASUMOTO T. Synthesis of stable quasicrystalline particle-dispersed Al base composite alloys [J]. J Mater Res, 1993......
on the above analysis, in the present investigation, the friction system under dry sliding conditions has evolved from quasicrystal against the hardened GCr15 steel disc into quasicrystal has much... of Al-Cu-Fe quasicrystalline composite coatings [J]. Mat Sci Eng A, 1998, A255: 54-65. [19]Biswas K, Galun R, Mordike B L, et al. Laser cladding of quasicrystal forming Al-Cu-Fe on aluminum [J......
by in-situ quasicrystal particles. Therefore, provided that a particle reinforced phase, which has excellent wettability and bond strength with magnesium matrix alloys and which improves strength... (99.9%) and manganese (99.9%) raw materials. The nominal and real compositions of alloys are listed in Table 1. Then, medium Mg-Zn-Y (MZY) quasicrystal-containing master alloy (0, 1.7%, 3.4%, 5.2......