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快速凝固粉末冶金TiB2颗粒增强AlFeVSi耐热铝合金 总被引:1,自引:1,他引:1
利用快速凝固粉末冶金方法制备了TiB2颗粒增强Al-8.5Fe-1.3V-1.7Si耐热铝合金试样以及不含TiB2颗粒的基体合金试样,通过光学显微镜、扫描电镜分析了其显微组织和断口形貌,采用X射线衍射进行了物相分析,并进行力学性能测试.结果发现,TiB2颗粒能有效地添加到Al-8.5Fe-1.3V-1.7Si耐热铝合金基体中,并能有效地抑制平衡相Al13Fe4的析出,且能细化晶粒,TiB2颗粒的存在使得粒度小于74μm粉末冶金合金挤压试样的室温强度高达454.1 MPa,屈服强度达407.8 MPa,延伸率保持在7.7%;350℃高温强度稳定在210 MPa以上,延伸率稳定在7.7%以上. 相似文献
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应用三元扩散偶技术测定了Ni-Cr-Mo三元系1358 K的等温截面,借助电子探针微区成分分析方法分析了Ni-Cr-Mo三元扩散偶的相区成分,并对其相关系进行了研究.测得Ni-Cr-Mo三元扩散偶在1358 K下存在一个中间化合物NiMo,Cr和Mo在扩散偶中形成连续固溶体,Ni和(Cr,Mo)有限固溶,扩散偶中未发现三元中间化合物.实验发现Ni-Cr-Mo三元系1358 K的等温截面存在一个三相区:Ni+NiMo+(Cr,Mo). 相似文献
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Mg-6%Al-5%Pb (mass fraction) anodes with different contents of zinc were prepared by melting and casting. The electrochemical
discharge behavior of these anodes in 3.5% NaCl solutions was investigated by galvanostatic test and electrochemical impedance
spectroscopy (EIS). The microstructures and the corroded surfaces of these anodes were studied by scanning electron microscopy
(SEM) and emission spectrum analysis (ESA). The phase structures and the corrosion products of the anodes were analyzed by
X-ray diffraction (XRD). The results show that zinc promotes the grain refinement of Mg-6%Al-5%Pb anode and makes the average
discharge potential of Mg-6%Al-5%Pb anode more negative during galvanostatic test. Mg-6%Al-5%Pb anode with the addition of
1% (mass fraction) zinc has the best electrochemical performance. The activation mechanism of zinc to Mg-6%Al-5%Pb anode is
as follows: The hydrolyzation of dissolved Zn2+ ions reduces the pH value of the solution near the surface of the anode and accelerates the dissolution of Mg(OH)2 film; The precipitated Zn(OH)2 with similar structure as Mg(OH)2 combines with Mg(OH)2 film easily and makes it break down. 相似文献
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采用快速凝固-粉末冶金法制备电子封装用高硅铝合金(Al-50 %Si),研究添加单质Cu粉对微观组织、力学性能和热物理性能的影响.采用扫描电子显微电镜(SEM)、X射线衍射仪(XRD)等手段,分析Cu含量(0~2 %)对微观组织和相组成的影响,并建立与力学性能和热物理性能之间的关系.结果表明:当Cu含量不高于1 %时,高硅铝合金微观组织中Si相尺寸和形貌改变不明显;拉伸强度和抗弯强度均随着Cu含量增加而迅速上升,并在2 %Cu时达到极大值268.4 MPa和422.6 MPa,相对于合金化前提高44.9 %和46.7 %;Cu含量对合金热膨胀系数(CTE)的影响不明显,但是基体中细小的Al2Cu相不利于导热性能(热导率下降7.5 %).综上,电子封装用高硅铝合金中添加1 %Cu时,可以在基本保持原有组织和热物理性能的情况下,提高强度20 %以上. 相似文献
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应用三元扩散偶技术测定Ni-Re-Ta三元系1473K的等温截面。用电子探针微区成分分析方法对Ni-Re-Ta三元扩散偶进行是得Ni-Re-Ta三元系在1473K下生成i3Ta、Ni2Ta、NiTa、NITa2和x相5个扩散层,在扩散 未发现三元化合物。 相似文献
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The magnetocaloric effect in alloys Gd(Al1-xCox)2 with x = 0, 0.05, and 0.10 were investigated using X-ray diffraction (XRD) and magnetization measurements. It was found that three alloys crystallized in a single phase with MgCu2-type structure. The lattice parameter and Curie temperature decreased with increasing Co content, whereas the magnetic-entropy change increased. With a magnetic-field change of 2 T, the maximum of the magnetic-entropy change reached 4.6 J·kg^-1·K^-1 near Curie temperature at approximately 95 K in the alloy GdAl1.8Co0.2, which appeared to be an alternative candidate for active magnetic refrigerants working in the temperature range centered at 100 K. 相似文献
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运用扩散偶技术并结合电子探针微区成分分析方法,对Ni-Ti-Si三元扩散偶进行了相分析,测得了Ni-Ti-Si三元系1173K下所生成的7个扩散层,即TiSi2、TiSi、Ti5Si4、Ti5Si3、Ti3Si、Nb5Si3和NbSi2;未发现在元化合物。根据实验所得的结线数据并结合扩散偶中的相区分布规则,得出了Nb-Ti-Si三元系1173K下的等温截面。 相似文献