【摘要】 主要通过SEM和TEM观察固溶时效过程β-CEZ钛合金ω相和α相的组织变化规律。发现β-CEZ合金在固溶处理后析出尺寸1～2 nm的无热ω相,在350～500℃时效处理时,ω相辅助形核析出长100～200 nm的针状α相,且随着时效温度升高,α相数量增多,尺寸略有长大。当时效温度达到550℃时,ω相基本消失,α相继续长大到约300nm。当时效温度升高到650℃以后,晶界析出大量的长条状α相,晶内α相长度长大到数微米。更多还原

【Abstract】 The microstructure evolution of ω and α phase in the solution treatment and aging process of β-CEZ alloy,which is a kind of typical near-β titanium alloy,was researched.The results show that ultrafine athermal ω precipitates(about 1～2 nm) are formed in β-CEZ alloy by quenching above the β transus temperature.Needle-like α precipitates,about 100 nm in length,are formed when solution treated β-CEZ alloy samples are aged at 350 ℃.The ω assisted α increases to about 200 nm in length while increasing ageing temperature to 500 ℃.The α precipitates grow to about 300 nm in length and ω disappears when the ageing temperature increases to 550 ℃.Long strip shape α is formed at grain boundaries and the intragranular α increases to several microns in length when the β-CEZ alloy samples are aged above 650 ℃.更多还原