Xinjiang HAO
,
Hongxiao LI
,
Gang ZHAO
,
Shiming HAO
材料科学技术（英）
The effect of prior deformation on the mechanical properties and microstructural evolution of aging process in a Cu-30Ni-25Fe (in at. pct) alloy has been studied by tensile test, hardness measurement, SEM and optical microscopy analysis. The results show that spinodal decomposition and recovery process interact on each other when aged at low temperature (600℃), and most of the defects induced by cold-work did not disappear in 100 h. When aged at high temperature (850℃), the discontinuous coarsening of the spinodal products takes place. The increase in yield strength and elongation of the sample aged at 850℃ for 5 h after deformation mainly results from the submicrometer grains produced by discontinous coarsening of spinodal products.
关键词:
Shiming HAO
,
Yuping REN
,
Hongxiao LI
,
Dapeng WANG
,
Gang ZHAO
材料科学技术（英）
The effect of Cu addition on the spinodal decomposition of the Al-Zn alloy with symmetrical compositions has been investigated by X-ray diffraction analysis. It is found that the single fcc phase can be obtained in the AlZn alloy with the addition of 2 at. pct Cu after solution treatment at 400℃ and water quenching to room temperature. The modulation structure occurs in two types of alloys aged at room temperature for 30 min. The spinodal process remarkably slows down above or at the three phase equilibrium temperature, particularly at room temperature due to the addition of 2 at. pct Cu. The spinodal time increases by 20 times when aging at 300℃ and by more than 30 times when aging at room temperature.
关键词:
Al-Zn(-Cu) alloy
,
null
,
null
,
null
