Cu-Ni-Al-Ti合金的时效特性
来源期刊：中南大学学报(自然科学版)1994年第2期
论文作者：邓至谦
文章页码：213 - 217
关键词：铜合金; 时效; 相变
Key words：Cu－alloy; aging; phase transformation
摘 要：通过电阻率、应力松驰性能和硬度的测定以及差热分析方法,研究了Cu－Ni－AL－Ti合金的时效特性。结果表明：该合金时效动力学符合AVrami方程,其LnLn1/(1─X)与Lnt之间的关系,可用两条不同斜率的直线段来描述,550℃时效时两直线交于Lnt＝6.4处,相应于时效时间10min,时效初期相变速率极高,随后逐渐降低;连续加热时,较低温度下形成的富溶质原子区在800～900℃区间可能重溶,γ相［Ni3(AL,Ti)］在高温下形成,并且可能向热力学更稳定的状态转化;除形成γ相外,还可能形成其它化合物;Cu－Ni－AL－Ti合金时效稳定性极高,过时效倾向很小。
Abstract: The aging character of Cu-Ni-Al-Ti alloy has been investigated by measuring resistivity、stress relaxation and hardness and by using DTA method.It is shown that the aging dynam-ics of this alloy is in agreement with the Avrami equation.The relationship between lnln 1/(1－X) and lnt can be described by sections of two lines with different gradients.When lnt≤6.4(aging time t＝10 min),lnln1/(1－X)＝0.7 146 lnt－4.775;when lnt≥6.4, lnln1/(1－t)＝0.2351lnt－1. 60.At early stage of aging the rate of phase transformation is veryhigh and then is slowly decreased.When heared continually the rich solute atoms region isformed at lower temperature and may be resolved in the region of 800～900℃, while γ＇phase［Ni3(Al,Ti)］ ls formed at higher teniperature and may be translated into more stablestate or other compounds are formed in addition to γ＇phase.Aging stabilily of Cu-Ni-Al-Tialloy is very high and the overage tendency is very small.
