Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： Three high- entropy alloys Co1.5CrFeNi1.5Ti0.5Mo0.1, AlCoCrFeNiSi0.1 and TaNbHfZrTi were prepared by arc melting. Their phase structure, microstructure and chemical composition were studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). A commercial alloy 690TT was used as the contrast material. The repassivation kinetics of the three high entropy alloys in high temperature pressurized water was investigated by means of electrochemical test. The results show that Co1.5CrFeNi1.5Ti0.5Mo0.1, AlCoCrFeNiSi0.1 and TaNbHfZrTi high entropy alloys are all composed of single phase. The crystallographic structure of Co1.5CrFeNi1.5Ti0.5Mo0.1 alloy is fcc, while that of the alloys AlCoCrFeNiSi0.1 and TaNbHfZrTi is bcc. The SEM results show that the Co1.5CrFeNi1.5Ti0.5Mo0.1 alloy showed a typical dendritic microstructure, of which the dendrite riches in Cr and Fe, but the interdendrite zone riches in Ti and Ni. There is no obvious element segregation observed in the AlCoCrFeNiSi0.1 alloy. The TaNbHfZrTi alloy also exhibited a dendritic microstucture, of which the dendrite riches in Ta and Nb, and the interdendrite zone riches in Hf, Zr and Ti. The repassivation rates of these four alloys in high-temperature pressurized water may be ranked as the following sequence: TaNbHfZrTi＞Co1.5CrFeNi1.5Ti0.5Mo0.1＞690TT＞AlCoCrFeNiSi0.1.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： The W fiber/Zr-based metallic glass composite was prepared by infiltration and rapid solidification. The effect of the ratios of length to diameter of fibers on the compressive properties of the composite was investigated in detail. The results show that the yield strength firstly decreases with the increase of the length to diameter ratio then reaches a stable value when the ratio is greater than 1. The plastic strain has no obvious change when the ratio is greater than or equal to 1.25, while the plastic strain is bigger than 50% when the ratio is smaller than 1.25. The reason for these phenomena is the comprehensive effect of the friction force between pressure head and the end of the compressive sample, the change of the length to diameter ratio of the metallic glass fibers between W fibers and the mismatching between metallic glass matrix and the W fiber during deformation.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： The influence of C content on the glass forming ability, thermal stability and corrosion resistance of Ni68.6Cr8.7Nb3P(16.5-x)B3.2Cx (x=0, 0.1, 0.3, 0.5, 0.7, 1, %) alloy was studied. The results show that an amorphous rod of 2 mm in diameter could be made for the alloy with 0.5 % C; a certain among of C addition can improve the thermal stability of the Ni- based amorphous alloy; with the increase of C amount, the corrosion resistance of amorphous ribbon in 1 mol/L H2SO4 solution is enhanced gradually.
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-04 Cooperative journals: 《金属学报》
Abstract：摘 要 采用渗流法，通过添加不同体积分数的304不锈钢毛细管成功制备出包含大量金属玻璃丝的新型Zr53.5Cu26.5Ni5Al12Ag3块状非晶合金复合材料。利用万能力学试验机分析了其压缩性能，利用白光干涉轮廓测量仪，X射线三维成像和SEM分析了其表面及断口形貌。结果表明：复合材料的塑性得到显著改善，其中毛细管体积分数为34%时，复合材料的压缩应变可达22%。同时在变形过程中出现了加工硬化现象，其加工硬化量与毛细管含量有关。断口呈近45°剪切断裂，表面较为平坦，毛细管撕裂与界面脱粘形成裂纹路径。毛细管变形严重，剪切带的数量随毛细管体积分数增加而增加；毛细管包裹的基体发生剪切滞后于毛细管外部的基体。毛细管增韧块状非晶复合材料的研究对大块非晶复合材料的增韧机制以及开发大块非晶合金在工程结构材料领域的应用具有重要意义。
Hits
Hits
Downloads
Comment