Fabrication of cold sprayed Al-intermetallic compounds coatings by post annealing

Effect of heat treatment on microstructure and mechanical properties of cold sprayed Ti coatings with relatively large powder particles

“…This is in agreement with findings in other previous studies. [14][15][16][17] On the other hand, besides the relatively large pores, many small pores in the size of sub-micrometers are still present in the annealed Ti coating, as seen in Fig. 6.…”

“…On the other hand, the post-spray heat treatment has been shown to be an effective method to modify the microstructure and properties of coldsprayed coatings. [14][15][16][17] In this article, the effect of post-spray heat treatment on the microstructure, microhardness, and adhesive strength of cold-sprayed Ti coating is investigated.…”

The use of kinetic metallization to form intermetallic reinforced composite coatings by post-spray heat treatment

“…Recently a variation of this technique has been applied to cold spray coatings comprising mixed elemental powders. In this variation, cold spray and subsequent heat treatment of mixed elemental powders in order to form in-situ intermetallic compounds such as Ti-Al and Ni-Al has been investigated [24,25]. Such intermetallic compounds are hard and of low density [26], and promise to form a wear resistant coating with good corrosion resistance in many service environments [27].…”

“…Novoselova and coworkers have demonstrated that cold sprayed Al-Ti powder mixtures can be reactively sintered to form intermetallics [24,29] within a temperature range from 650°C to 850°C. Lee et al reported [25] the formation of Ni-Al compounds within their coatings after annealing treatments between 450°C and 630°C. Previous results cannot be applied to substrates such as Mg-Al based alloys because the eutectic temperature of this system is 437°C.…”

Microstructural evolution and microhardness of a melt-spun Al–6Ni–2Cu–1Si (in wt.%) alloy

“…In these studies, intermettallic Al 3 Ni phase has found and this phase contributed to improve the hardness at the expense of its ductility. Moreover, among the ternary Al-Ni-X (Sheber et al, 2001;Lee et al, 2006;Li et al, 2006;Olofinjana and Atrens, 1997;Chang and Botten, 1997;Zhong et al, 1997;Gibson and Bettles, 2002;McKay et al, 2001;Isheim et al, 2003;Srinivasan and Chattopadhyay, 1998;Kim et al, 2001Kim et al, , 2003Zhang et al, 2002;Hong et al, 2003) alloys, Al-X-Zr Chattopathyay, 2004), Al-Si-Cu (Öveçoglu et al, 2003), Al-Si-Fe (Ünlü et al, 2002), Al-Si-Mg (Yan et al, 2000) and Al-Mn-Sr (Vojtech et al, 2006) have also been studied using by rapidly solidified techniques, including melt spinning. These transition elements, when alloyed in various combinations with aluminum, form fine dispersed of high-modulus second-phase particles, resulting in increased strength, wear resistance and thermal stability.…”