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Nanometric particles of a new chromium structure were produced by mechanical alloying ofCr 3 P 2under low nitrogen pressure. X-ray diffraction study has shown that the particles have an ordinarybccstructure of chromium(α-Cr)up to 1 h of milling but they have a newcubicchromiumA15-typestructure(δ-Cr),up to 2 h of milling, with a lattice parameter equal to 0.4703 ± 0.001 nm. The new structure has aPm-3space group with eight atoms distributed within the unit cell: 2Cratoms with occupancy equal to 1 in positions:1a: 000and1 b: ½½½in addition to 6 othersCratoms with occupancy equal to 0.25 in positions:6f: ¼ 0 ½; 6f: ½ ¼ 0; 6f: 0 ½ ¼; 6f: ¾ 0 ½; 6f: ½ ¾ 0; 6f: 0 ½ ¾. As well as the newδ-Cr A15-typephase two chromium phosphides are formed in the nanometricCr 3 P 2alloy: an orthorhombicCrPand the monoclinicCrP 2after 1 and 2 h of milling, respectively. Therefore, the formed phosphide records the highest density of dislocations and the lowest stacking fault probability after 2 h of milling. The mechanical properties show that thePandCrPare auxetic strong reentrant cellular structures with negative  Poisson’s  ratio which makes them specifically resistant.

Structural, microstructural and mechanical properties of Cr 3 P 2 chromium phosphide powders