Intrinsic Properties and Structure of AB 2 Laves Phase ZrW 2
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ZIRCONIUM and zirconium-alloys have been widely applied in the nuclear industry as cladding and structural materials, due to their low thermal neutron absorption, high strength, and excellent corrosion resistance.[1–7] The tungsten with the highest melting point among metals possesses great resistance to high temperature and is used as filaments, targets for X-ray production, and components of spacecrafts and missiles. Besides, tungsten also has huge potential nuclear applications because of its desirable combination properties.[8–12] It is reported that Zr alloying W shows great elastic properties,[13] while the mechanical and thermodynamic properties of W can be effectively improved by the addition of other elements.[14,15] Therefore, it is expected that Zr-W alloys will be promising materials in nuclear engineering. Over the past decades, numerous efforts have been performed toward achieving this goal.[13,16–19] For instance, the Zr-W refractory alloys are supposed to be promising reactive materials, as they have outstanding mechanical properties and high energy level.[16–19] In reality, within the hostile serving environment, the temperature and pressure will suddenly and sharply change, which requires the materials to have great
JUNYAN WU, BO ZHANG, and YONGZHONG ZHAN are with the College of Materials Science and Engineering, Guangxi University, Nanning, Guangxi 530004, P.R. China and also with Guangxi MinistryProvince Jointly-Constructed Cultivation Base for State Key Laboratory of Processing Non-ferrous Metal and Featured Materials, Guangxi University. Contact e-mail: [email protected] Manuscript submitted December 5, 2016. METALLURGICAL AND MATERIALS TRANSACTIONS A
thermal and mechanical resistance. It is a challenge for scientists to develop new types of Zr-W reactive materials. In the Zr-W system,[20] the AB2 Laves phase ZrW2 is the only intermetallic possessing a high melting point up to about 2473 K (2200 C). As previously revealed, intermetallic-forming reactive materials can be competent for energy reactants and structural components because of their satisfying mechanical properties.[16] Also, it is generally known that the intrinsic properties of phases have great influence on the properties of an alloy.[21] The ZrW2, hence, is of highly practical significance for the properties of Zr-W alloys. Laves phase ZrW2 is a polymorph that contains C14, C15, and C36 crystal structures. Usually, cubic C15 phase is expected to exhibit greater deformability than hexagonal C14 and C36 phases due to its fcc-based structure. The structural properties of C15 ZrW2 have been studied already.[22,23] Deligoz et al.[24] found that C15 ZrW2 is more stable than its corresponding C14 and C36 phases; the superconductivity properties on annealed alloys of ZrW2 have been also measured.[24] However, its other intrinsic properties, such as anisotropic behaviors and some thermal properties, have been rarely reported and are still scarce. Accordingly, it is essential and meaningful to study in depth the intrinsic propertie
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