Ternary W-Ni-Fe tungsten heavy alloys: A first principles and experimental investigations

Effects of Co and Co + Mo additions on tensile properties of tungsten heavy alloys: first-principles study and experimental investigations

“…Interestingly, both the systems (82-S, 82C-S and 82CM-S) as well as alloys (82, 82C and 82CM) display similar nature of the typical engineering stress-strain curves. It is known that the flow curves of W and matrix phases reflect highest and lowest strain hardening, respectively [19]. As the strength values of systems and alloys lie in between pure W and matrix phases (Tables 7 and 8), the flow curves of the present alloys as well follow similar trends.…”

“…The differences in yield strength values of both the results are more or less similar with marginal improvement in the present work. However, the differences in strength values at higher strain (at around 9%) in calculated and their experimental counterparts in the present work have considerably reduced in comparison to that of the previous work [19]. Present results thus suggest that both the increase in the number of W-grain-matrix interfaces as well as W atoms in supercell are quite crucial to match the experimental values of yield and strengths at higher strain values, respectively.…”

“…The microstructure and mechanical properties of W-Ni-Fe, W-Ni-Fe-Co and W-Ni-Fe-Co-Mo alloys have been reported by several investigators [15][16][17][18]. The mechanical behaviour of three virtual ternary WHA systems has been investigated using first-principles calculation [19]. In this work, the virtual alloy systems consist of the W-grain and matrix phase with a single fcc-bcc interface.…”

Microstructure and strengthening mechanisms of 90W–7Ni–3Fe alloys prepared using laser melting deposition

“…It has been shown, for example, that if small powders are used even higher strength can be obtained with LMD, while still retaining a uniform elongation of ~5% for a 75W-17.5Ni-7.5Fe alloy [27]. Compared to the reported as-sintered LPS samples [6,7,13,[37][38][39][40][41][42][43][44], LMD provides a higher tensile strength. Note that some of the LPS samples have higher strengths than the present reference LPS sample.…”

System Development for Diffusion Bonding of Multiple Unit Tubes to Produce Long Tubular Tungsten Heavy Alloys

“…Tungsten heavy alloys (THAs) are a typical class of multi-phase composites consisting of tungsten powders embedded in a ductile matrix phase with lower melting point binder metals such as Ni, Fe, Cu, and Co. As the melting point of tungsten is excessively high, binder metals have been mixed to form a liquid phase when heated to a moderate temperature. The melted binder metals induce wetting of the tungsten grains, leading to the attainment of full density through the tungsten grain densification and rearrangement [1,2]. As tungsten is the practical element for a wide range of uses in density driven applications, THAs have been widely used in making counterbalance for vibration dampening, parts for military defense, such as missile weapons and fire arms, and in many applications that require long tubular or hollow shapes.…”