Evaluation of methods to produce tough Cr3Si based composites

A wear resistant ductile metal-toughened Cr13Ni5Si2 ternary metal silicide alloy

“…are considered as a new class of high-and/or ultra high temperature candidate structural materials due to their combinations of high melting point, low density, high stiffness, high elastic modulus and excellent creep and oxidation resistance [1][2][3][4][5][6][7][8][9][10]. Many of the transition metal silicide-based alloys have also preliminarily demonstrated to have outstanding tribological properties because of their inherent high hardness [11][12][13][14][15][16][17].…”

“…Incorporation of a ductile second phase by alloying the monolithic metal silicides alloys with one or more alloying elements was demonstrated to be one of the most effective methods to enhance the toughness and ductility for many intermetallic alloys and ductile metaltoughened intermetallic alloys such as Cr 3 Si/Cr, g 0 -Ni 3 Al/g, MoSi 2 /Nb, Nb 5 Si 3 /Nb, etc. have been fabricated with good toughness [9,[18][19][20][21][22][23][24].…”

Microstructure and sliding-wear behavior of tungsten-reinforced W-Ni-Si metal-silicide in-situ composites

“…There are also no microcracks observable at the corners of the Vickers indentation marks, even when the test load is as high as 1000 g, while such indentation-cracking phenomena were widely reported for many binary metal-silicide alloy such as Mo 5 Si 3 , Ti 5 Si 3 , MoSi 2 , Cr 3 Si, etc., [12,23,26] and the indentation-cracking phenomenon was proposed and widely accepted as a method to evaluate the fracture toughness of brittle materials such as Cr 3 Si by correlating the relationship between the indentation load and the cracking length. [27] All of the aforementioned experimental phenomena imply that the in-situ incorporation of the rapidly solidified strong and tough tungsten primary phase in the W-Ni-Si intermetallic matrix noticeably enhanced the strength and toughness, which is naturally beneficial for their performance when employed as both structural and wear-resistant materials. Because of the in-situ reinforcement of W-Ni-Si metalsilicide intermetallic alloys by the primary tungsten grains, which are strong, tough, and both abrasively and adhesively wear resistant, the laser-melted W/W-Ni-Si intermetallicmatrix in-situ composites exhibited quite outstanding sliding-wear properties under both room-temperature and elevated-temperature sliding-wear-test conditions, as shown Figure 10.…”

“…[2,[19][20][21] Moreover, it is widely demonstrated that in-situ incorporation of ductile refractory metallic phases can significantly enhance the toughness and strength of many refractory-metal silicide-based alloys. [22][23][24][25][26][27] However, to the knowledge of the authors, no information is currently available in the open literature on the development of multicomponent, multiphase metal-silicide-matrix composites as potential wear-resistant materials. In this article, W-Ni-Si silicide intermetallic-matrix composites with in-situ reinforcement of refractory tungsten particles are fabricated using a newly invented water-cooled copper-mold laser melting furnace by the LASMELT* process.…”

Corrosion properties of a Cr13Ni5Si2-based metal silicide alloy

“…Developing high-performance corrosion-and wear-resistant materials is of great significance. Ordered metal silicides such as Cr 3 Si have attracted increasing attention in the past decades because of their many attractive properties such as high melting point, low density, high hardness, excellent creep resistance and oxidation resistance [1][2][3][4][5]. However, the rather low ductility at room temperature has hindered the development of these silicides as compared with many other structural intermetallics [6][7][8][9].…”