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Effects of Re addition on phase stability and mechanical properties of hexagonal OsB2
Journal of the American Ceramic Society ( IF 3.9 ) Pub Date : 2017-09-18 02:26:00 , DOI: 10.1111/jace.15219
Ying Long 1 , Canhui Zou 1 , Xin Zheng 1 , Hua-Tay Lin 1 , Fenglin Zhang 1 , Chengyong Wang 1 , Linan An 2
Affiliation  

ReB2-type hexagonal Osmium diboride (OsB2) has been predicted to exhibit higher hardness than its orthorhombic phase, but hexagonal-orthorhombic phase transformation occurs at temperature higher than 600°C, resulting in the decrease in its hardness. Therefore, ReB2-type hexagonal OsB2 samples with Re addition were produced by a combination of mechanochemical method and pressureless sintering technique, and the effects of Rhenium (Re) addition on phase composition, thermal stability and mechanical properties of OsB2 were investigated in this study. X-ray diffraction (XRD) analysis of the as-synthesized powders by high-energy ball milling indicates the formation of hexagonal Os1-xRexB2 solid solution with Re concentration of 5 and 10 at.% without forming a second phase. After being sintered at 1700°C, part of the hexagonal phase in OsB2 transformed to orthorhombic structure, while Os0.95Re0.05B2 and Os0.9Re0.1B2 maintained their hexagonal structure. This suggests that the thermal stability of the hexagonal OsB2 was significantly improved with the addition of Re. Scanning electron microscopy (SEM) photographs show that all of the as-sintered samples exhibit a homogeneous microstructure with some pores and cracks formed throughout the samples with the relative density >90%. The measurements of micro-hardness, nano-hardness, and Young's modulus of the OsB2 increased with Re addition, and these properties of the sample with 5 at.% addition of Re is higher than that with 10 at.% Re.

中文翻译:

添加稀土对六方OsB2相稳定性和力学性能的影响

据预测,ReB 2型六方六方硼化((OsB 2)的硬度高于其斜方晶相,但六方斜方晶相的转变发生在高于600°C的温度下,导致其硬度降低。因此,结合机械化学方法和无压烧结技术,制备了添加Re的ReB 2型六角形OsB 2样品,并研究了hen(Re)对OsB 2相组成,热稳定性和力学性能的影响。这项研究。通过高能球磨对合成粉末进行X射线衍射(XRD)分析,表明形成了六方Os 1-x Rex B 2固溶体,Re浓度为5和10 at。%,而没有形成第二相。在1700℃下烧结后,OsB 2中的六方相的一部分转变为正交结构,而Os 0.95 Re 0.05 B 2和Os 0.9 Re 0.1 B 2保持其六方结构。这表明六角形OsB 2的热稳定性稀土元素的添加显着改善。扫描电子显微镜(SEM)照片显示,所有烧结后的样品均显示出均匀的微观结构,在整个样品中均形成了一些孔和裂纹,相对密度> 90%。OsB 2的显微硬度,纳米硬度和杨氏模量的测量随Re添加而增加,并且添加5 at。%的Re的样品的这些性能高于添加10 at。%的Re的样品的这些性能。
更新日期:2017-09-18
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