The changes in structure and the hardness of two electroless deposited Ni-P alloy coatings (with P content of 1.5 and 9.5 wt pet) with heat treatment have been studied by XRD and TEM. The deposits containing 1.5 wt pe...The changes in structure and the hardness of two electroless deposited Ni-P alloy coatings (with P content of 1.5 and 9.5 wt pet) with heat treatment have been studied by XRD and TEM. The deposits containing 1.5 wt pet P can be represented as an fee NiP supersaturated solid solution of 5 similar to 10 nm microcrystallites, whereas the deposits containing 9.5 wt pet P are amorphous. The heat treatment process induces crystallization of amorphous Ni to Ni phosphides and fee Ni. Both of the deposits reach maximum hardness after annealing at 400 degrees C for 1 h. All coated steel specimens are inferior in fatigue strength to uncoated steel specimens mainly due to the poor fatigue resistance of the coating itself.展开更多
The hybridized state of each atom changes with various changes of alloying elements and different alloying degrees. It is shown that during the course of alloying, the changes in the microsolid_state reflection such a...The hybridized state of each atom changes with various changes of alloying elements and different alloying degrees. It is shown that during the course of alloying, the changes in the microsolid_state reflection such as atomic hybridized state make the corresponding VES parameters change, and that affects the mechanical properties of Fe-3Al alloys.展开更多
文摘The changes in structure and the hardness of two electroless deposited Ni-P alloy coatings (with P content of 1.5 and 9.5 wt pet) with heat treatment have been studied by XRD and TEM. The deposits containing 1.5 wt pet P can be represented as an fee NiP supersaturated solid solution of 5 similar to 10 nm microcrystallites, whereas the deposits containing 9.5 wt pet P are amorphous. The heat treatment process induces crystallization of amorphous Ni to Ni phosphides and fee Ni. Both of the deposits reach maximum hardness after annealing at 400 degrees C for 1 h. All coated steel specimens are inferior in fatigue strength to uncoated steel specimens mainly due to the poor fatigue resistance of the coating itself.
文摘The hybridized state of each atom changes with various changes of alloying elements and different alloying degrees. It is shown that during the course of alloying, the changes in the microsolid_state reflection such as atomic hybridized state make the corresponding VES parameters change, and that affects the mechanical properties of Fe-3Al alloys.
