Xinjiang HAO
,
Hongxiao LI
,
Gang ZHAO
,
Shiming HAO
材料科学技术（英文）
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:
Juntao LI
,
Yaping ZONG
,
Shiming HAO
材料科学技术（英文）
The α(α2)/γ phase equilibria in Ti-Al-X (X = C, B, Fe, Si in at. pct) ternary systems were studied by equilibrium heat-treatment and EPMA. The results show that the addition of B to the Ti-Al binary system leads to a shift of both α(α2)/[ α(α2)+γ] and [α(α2)+γ]/γ phase boundaries to Al-rich side and 0.1 B addition decreases Tα by 18℃. The addition of C leads to a shift of [α(α2)+γ]/γ phase boundary to Al-rich side but the effect of 0.2 at.pct C addition on Tα is very slight. The addition of Fe results inα(α2)/ [α(α2)+γ] and [α(α2)+γ]/γ phase boundaries shifting to Ti-rich side and 1.0 Fe addition increases Tα by 90~110℃. The addition of Si leads to a shift of α(α2)/α(α2)/ [α(α2)+γ]} phase boundary to Ti-rich side and the 0.3 Si addition increases Tα by 80~110℃. The solubilities for C, B and Si in α(α2) phase are higher than those in the γ phase but the solubility for Fe in α(α2) phase is lower than that in γ phase.
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