The space group of PrCo<sub>12</sub>B<sub>6</sub>,compound has been determined using the convergent beam elec-tron diffraction method.The space group is found t
The hydrogen distribution curve along cross-section of high pressure hydrogen charged spec-imens of 21Cr-7Ni-9Mn-N austenitic steel was obtained quantitatively
The microstructure and mechanical properties of TiB<sub>2</sub> /B<sub>4</sub>C composites have been investi-gated.It was found that both the strength and hardn