Precipitation hardening is the most effective strategy to enhance mechanical properties of metals. Dislocation mechanisms control strengthening during precipitation have been demonstrated extensively. However, owing complexity different precipitates in alloys, variations ductility caused by are complex and not clarified so far. In this study, effects on aluminium alloys investigated based a mod...

This research aimed to conduct a passive layer state study on martensitic and semi-austenitic precipitation hardening stainless steels (PHSS) passivated in citric acid nitric baths at 49 70 °C for 50 75 min subsequently exposed 5 wt.% NaCl 1 H2SO4 solutions. Corrosion behavior of the material was observed by using potentiodynamic polarization (PP) according ASTM G5-11 standard. The microstructu...

The behavior of a A356+0.5 wt%Cu alloy used to manufacture cylinder heads was studied. Samples were solutionized, quenched and aged at 200 °C for 0.1, 1, 10 100 h. TEM characterization showed that the short aging durations (up h), dominating hardening precipitates β″ rods, while long duration (100 dominance shifted Q-phase (Q′, Q″ precipitates). length diameter rods measured produce size distri...

Abstract Since the high entropy concept was proposed at beginning of millennium, research focus this alloy family has been wide ranging. The initial search for single-phase alloys expanded with aim improving mechanical properties. This can be achieved by several strengthening mechanisms such as solid-solution hardening, hot and cold working precipitation hardening. Both single- multiphase high-...

The effect of solution temperature on the aging hardening behavior Al-15%Mg2Si(-1%Cu) alloys was studied by characterizing precipitation behaviors nano-precipitates. After rises from 520 °C to 550 °C, more solute atoms are available for precipitation, and formation activation energies precipitates (?'' S) decrease. So ?''/?? in Al-15%Mg2Si alloy S Al-15%Mg2Si-1%Cu is accelerated at a which enha...