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放热峰
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  “放热峰”译为未确定词的双语例句
    By means of Differential scanning calorimeter (DSC), the crystallization of Ni_(41)Ti_(20.3)Zr_(21.8)Al_(8.4)Cu_5Si_(3.5) BMG alloy under different continuous heating rates showed a single exothermic stage.
    对不同升温速率下Ni_(41)Ti_(20.3)Zr_(21.8)Al_(8.4)Cu_5Si_(3.5)非晶合金的变温晶化行为研究表明:DSC热分析曲线展示单一晶化反应的放热峰;
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    The glass transition temperature Tg, the onset crystallization temperature Tx, and the crystallization peak temperature Tpi of the Zr57Al10Ni12.4Cu15.6Nb5 BMG are found to depend on the heating rate during the continuous heating. This phenomenon indicates that the glass transition and crystallization behave in a marked kinetic nature.
    本文还进行了多种扫描速度的DSC试验,结果发现,Zr_(57)Al_(10)Ni_(12.4)Cu_(15.6)Nb_5大块非晶合金的玻璃化转变温度,晶化开始温度,晶化放热峰温以及过冷区间的宽度都表现出明显的动力学效应。
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    Using DSC analysis, we can get some parameters that mark glass forming ability, such as glass transformation temperature T_g, crystalline temperature Tx, peak temperature T_p and melting temperature T_m.
    采用差示扫描量热(DSC)分析法获得了玻璃转变温度 T_g,结晶开始温度 T_x,结晶放热峰温度 T_p 和熔点温度 T_m。
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    (2) From DAT digram of NiP amorphous coating two thermal releasing peaks at 235℃ and 391℃,corresponding to the nucleation and precipitation of Ni3P phase, respectively, are observed. This can explain the appearance of the highest microhardness and wear resistance at 400℃×1h heat treatment for NiP coatings.
    (2)Ni-P非晶在加热过程中具有两个明显的放热峰,235℃为Ni3P相的形核孕育峰和391℃为Ni3P相的析出峰,因而使得Ni-P非晶合金在400℃×1h热处理后具有最大的显微硬度和最佳的耐磨性;
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    The IF peak does not change its position with the variation of frequencies, and increases in height and shifts to higher temperature with the heating rates increasing, which indicate that the IF peak exhibits the features of that of the first-order transition in crystalline solids.
    与DSC试验结果进行对比发现,整个玻璃化转变区间都处在内耗峰的左侧,而且晶化开始以后,内耗还在继续增加,以至于内耗峰的峰位处在DSC曲线上的晶化开始温度和晶化放热峰温之间。
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The crystallization of metallic glasses is not just asimple transformation from the amorphous state to the final crystallization state. Instead it can be a rather complicated phenomenon taking place in several steps. However current crystallization analyses of metallic glasses are generally limited to cither crystallization kinetics or phase identification[3]. In the present paper, three aspects of crystallization of metallic glass are all considered. Crystallization thermodynamics and kinetics, phase sequence,...

The crystallization of metallic glasses is not just asimple transformation from the amorphous state to the final crystallization state. Instead it can be a rather complicated phenomenon taking place in several steps. However current crystallization analyses of metallic glasses are generally limited to cither crystallization kinetics or phase identification[3]. In the present paper, three aspects of crystallization of metallic glass are all considered. Crystallization thermodynamics and kinetics, phase sequence, and morphologies of amorphous Ni_(68)B_(21)Si_(11) alloy have been respectively and systematically investigated by DSC (differential scanning calorimetry), XRD (X-ray diffraction) and TEM (transmission electron microscopy). The five contributions of the paper will be stated and then concisely explained. (1) Correlation between the exothermal peaks and phase formation has been obtained for the first time.This correlation is obtained through examining the crystallization process of amorphous Ni_(68)B_(21)Si_(11) alloy during isothermal annealing and nonisothermal heating. The examination is done by combining DSC and XRD with TEM. (2) The thermal stability of Ni_(68)B_(21)Si_(11) amorphous alloy measured by DSC is found to be much higher than that of Ni_(78)B_(14)Si_8 [3] and Ni_(75)B_(17)Si_8 [4] alloys. (3) It is found that when heating rate is lowered sufficiently, the number of exothermal peaks on DSC curve of metallic glass Ni_(68)B_(21)Si_(11) changes from 2 to 3. Up to now, the numbers of exothermal peaks on DSC curves of the other metallic glasses have already been found to remain unchanged when heating rate varies. (4) For isothermal annealing, the authors find a new stage in the transformation sequence of amorphous Ni_(68)B_(21)Si_(11) : the appearance of a metastable phase with a f.c.c. structure, α= 5.15A within the amorphous matrix. In this new first stage, spherical metastable crystalline 0.1—0.3μm in diameter is formed after annealing 30min at 753K. (5) The polygon nanocrystalline of 30nm in grain size is obtained through so controlling crystallization as to reach a fully stable microstructure.

本文采用差示扫描量热仪(DSC),X射线衍射仪(XRD)及透射电镜(TEM)系统地研究了金属玻璃Ni_(68)B_(21)Si_(11)分别在等温退火和连续加热过程中的晶化动力学与相形成顺序。Ni_(68)B_(21)Si_(11)非晶合金具有较高的热稳定性,其DSC曲线因升温速率不同而呈现两个或三个晶化放热峰。首次发现该金属玻璃在向稳定晶体转变之前,形成一种f.c.C.结构的亚稳相。

The isothermal crystallization behavior of amorphous Fe(77.5)Si(13.5)B9, Fe(74.5)Si(13.5)B9Nb3, Fe(76.5)Si(13.5)B9Cu1 and Fe(73.5)Si(13.5)B9Cu1Nb3 (at.-%), have been investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). During the isothermal annealing process, Fe(77.5)Si(13.5)B9 exhibits two connected exothermal peaks, corresponding to the precipitation of crystalline α-Fe(Si) phase and Fe2B compound, resistively, and Fe(74.5)Si(13.5)B9Nb3 displays a symmetric exothermal Peak resulting...

The isothermal crystallization behavior of amorphous Fe(77.5)Si(13.5)B9, Fe(74.5)Si(13.5)B9Nb3, Fe(76.5)Si(13.5)B9Cu1 and Fe(73.5)Si(13.5)B9Cu1Nb3 (at.-%), have been investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). During the isothermal annealing process, Fe(77.5)Si(13.5)B9 exhibits two connected exothermal peaks, corresponding to the precipitation of crystalline α-Fe(Si) phase and Fe2B compound, resistively, and Fe(74.5)Si(13.5)B9Nb3 displays a symmetric exothermal Peak resulting from α-Fe(Si) and Fe(23)B6 and Fe3B, while both Fe(76.5)Si(13.5)B9Cu1 and Fe(73.5)Si(13.5)B9Cu1Nb3 show an asymmetric exothermal peak originating from the formation of α-Fe(Si) solid solution. Measurements from XRD data show that grain size of α-Fe(Si) phase is about 35nm and 10nm in the crystalline Fe(76.5)Si(13.5)B9Cu1 and Fe(73.5)Si(13.5)B9Cu1Nb3 samples, resistively. Though single crystalline phase of α-Fe(Si) can not be obtained in the crystallized Fe(74.5)Si(13.5)B9Nb3 alloy, its α-Fe(Si) crystalline phase is finer, about 15nm. Based on above results, it is concluded that Cu accelerates α-Fe nucleation process and Nb suppresses its growth, leading to theformation of the ultrafine nanocrystalline α-Fe(Si) phase. Moreover, the causes to the asymmetric α-Fe(Si) exothermal Peak in the Cureontaining alloys are discussed.

采用示差扫描量热卡计(DSC)得到了非晶态Fe─Si─B合金加入Cu和Nb后的等温晶化放热曲线,结合X射线衍射(XRD)分析,明确了Cu和Nb在形成纳米α─Fe(Si)晶体相时的作用.此外,非晶态Fe(76.5)Si(13.5)B9Cu1和Fe(73.5)Si(13.5)B9C1Nb3等温晶化的α─Fe(Si)放热峰呈明显的非对称形状

The evolutional characteristics of the amorphous aluminum alloy Al88Ce2Ni10 during crystallization has been studied and analyzed by XRD and TEM It is found that the crystallization of melt-quenched amorphous Al88Ce2Ni10 takes place in two stages: primary crystallization and multiple crystallization At 453K, the first stage starts with the precipitaion of nanoscale fcc α-Al The grain size, number and volume fraction of crystalline fcc α-Al exhibit different increase with the increase of annealing...

The evolutional characteristics of the amorphous aluminum alloy Al88Ce2Ni10 during crystallization has been studied and analyzed by XRD and TEM It is found that the crystallization of melt-quenched amorphous Al88Ce2Ni10 takes place in two stages: primary crystallization and multiple crystallization At 453K, the first stage starts with the precipitaion of nanoscale fcc α-Al The grain size, number and volume fraction of crystalline fcc α-Al exhibit different increase with the increase of annealing temperature At 615K, the second stage starts with the transformation of the remaining amorphous phase into the intermetallic compounds Al3Ni and Al11Ce3 The corresponding microstrusture is nanocrystalline and multiphase

通过用XRD和TEM对非晶Al88Ce2Ni10铝合金晶化过程中组织结构的演变特征进行研究和分析,发现:液淬Al88Ce2Ni10非晶铝合金的晶化过程是由初晶型晶化和多重型晶化两个相继的晶化阶段所组成。自第一阶段的晶化放热峰的峰值温度453K起,非晶基体内析出纳米级面心立方结构(fc)α-Al粒子,且随退火温度的增加,其粒子尺寸、数量及结晶体积分数均有不同程度的增加;在第二阶段的晶化放热峰的峰值温度615K以上,剩余非晶直接转变成稳定的Al3Ni和Al11Ce3金属间化合物,相应的微观组织为纳米晶多相结构

 
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