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Ultrahigh strength Mg-Y-Ni alloys obtained by regulating second phasesS.Z.Wu,X.G.Qiao,M.Y.ZhengSchool of Materials Science and Engineering, Harbin Institute of Technology摘 要:Mg-Y-Ni alloys with different second phases were designed by changing Y/Ni atomic ratio from 1.5 to 0.5.The microstructure and mechanical properties of as-cast and as-extruded......
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of the phases. The microhardness of the field-treated specimen is always higher than those of the non-field ones that indicates the high magnetic field strengthens the hardening effect. Key words: Al-Cu alloys; high magnetic field; ageing behavior; precipitated phases Al-Cu合金是典......
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Thermodynamic properties of stable and metastable phases of Pt metal PENG Hong-jian(彭红建)1, 2, XIE You-qing(谢佑卿)2, NIE Yao-zhuang(聂耀庄)2 1. School of Chemistry and Chemical...: Isometric heat capacity cv and isobaric heat capacity cp of Pt with stable and metastable phases were calculated by using pure element systematic theory. These results are in excellent agreement with of SGTE......
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300 ℃, the iron content of silicate minerals containing iron decreases to 9.13%. Key words: iron tailings; reduction; hedenbergite; silicate phases 深度还原是指将复杂难选含铁物料在低于其熔化温度下,用还原剂将含铁矿物还原成金属铁,并使金属铁长成为一定...Rigaku-RA 高功率旋转阳极X线衍射仪(12 kW),Cu靶,步长为0.02°,扫描范围为10°~90°,扫描速度为5°/min,电压为40 kV,电流为150 mA. 4) SEM及EDS能谱分析.用SEM及EDS能谱分析研究不同温度条件下矿物微观结构和成分变化,其分析采用德国卡尔蔡司EVO18 扫描电子显微镜及Bruke XFlash Detector 5010 能谱分析仪. 2 结......
Identification of Crystalline Phases in Toothpaste byPowder Diffractometry沙维摘 要:IdentificationofCrystallinePhasesinToothpastebyPowderDiffractometryShaWei(沙维)(DepartmentofCivilEngineering,TheQueen'sUniversi...关键词:......
alloy. The distribution of prismatic shaped β′ phases and cubic shaped β-Mg24Y5 precipitate phases in Mg matrix may account for the remarkable enhancement of tensile strength of Mg-Y-LPC-Zr alloy... and a good coherent to the matrix [8]. ROKHLIN et al [9] reported that Mg alloys containing two RE metals which belong to different subgroups can promote strengthening effectively. Now, the RE metals......
[7-8],从而产生局部高压,能使初生树枝晶破碎,增加了形核质点.这些形核质点在声流的作用下均匀弥散分布于铝熔体中,而且声流有利于使铝熔体的温度场均匀稳定,故凝固时能形成细小,均匀的等轴晶. 表2所示为用电子探针分析仪对普通铸锭和超声铸锭的基体组织进行打点分析得到的主要元素质量分数.由表2可以看出:与普通铸锭相比,在超声外场下α-Al中的Zn元素质量分数增加了22%,Mg元素质量分数增加了54%,Cu...提高了基体相和第二相的形核率,并细化了晶粒和第二相尺寸.声流的搅拌作用能使熔体温度场更加均匀,提高与外界的对流换热能力,并对促进第二相颗粒的弥散分布和清洗表面杂质有着重要的作用. 根据Al-Cu二元合金相图[9],当Cu质量分数为1.75%时,铝合金凝固过程中形成CuAl2的温度为380 ℃,Al2Cu相几乎不溶入其他元素.根据Al-Zn-Mg三元合金相图[9],当Zn质量分数为7.36%,Mg质......