A mechanical alloying process for a mixture of elemental Fe and Cr powders with the Cr compositions 20-70 at. % was investigated through the measurements of x-ray diffraction, magnetization, and 57Fe Mijssbauer spectrum. We show that magnetic studies provide more detailed information about the alloying process occurring during ball milling than the conventional diffraction techniques in this particular system. A final product after ball milling was identified as a high-temperature phase of the a solid solution, regardless of compositions studied. Powders subjected to milling in Ar gas atmosphere for 200 h were further ball milled in Nz atmosphere. The presence of N2 gas has caused a partial amorphization. The amorphous phase thus produced is found to be paramagnetic at room temperature.
Bcc-like metastable powder of iron nitride can be synthesized by mechanical alloying of a mixture of elemental Fe and γ′-Fe4N powders. Its heat of formation deduced from differential scanning calorimetry is about +6.5 kJ/mol at a composition of 11 at%N. Both this value and its magnetization at room temperature are in good agreement with those of the bcc-like powder produced by ball milling of elemental Fe powder in NH3 gas atmosphere.
Our previous Studies Showed a possibility of mechanical evaluation of so-called fabric hand by measuring the withdrawal resistance of the fabric through a ring hole. Conforming to the idea, a practical fabric handling tester was constructed and its characteristics were studied and dis cussed. It was recognized that the tester can be used as a practical means to rank the fabric hand, and moreover, that it has the following merits in comparison with other methods.1) Higher reliability of the results.2) Easier handling of the tester.3) Easier preparation of the test piece.4) More sharply evaluated results are expected.
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