Cu 5Ni 4Sn 3Al合金的时效强化

AGING STRENGTHENING OF Cu 5Ni 4Sn 3Al ALLOY

根据合金的力学和电学性能， 利用ＸＲＤ，ＴＥＭ 和ＳＥＭ 技术研究了Ｃｕ５Ｎｉ４Ｓｎ３Ａｌ 合金的时效强化。结果表明：３５０ ℃下时效时， 力学性能增加； 边带分析有边带效应， 且随时效时间的增加调幅波长增加。电镜下观察到调幅结构， 说明该合金是调幅分解强化的合金。同时， 铝的加入没有改变合金的相结构， 但是， 对合金的强化起着重要作用。实验结果还表明， 合金在时效过程中， 调幅分解的同时还形成ＤＯ２２（ＴｉＡｌ３） 型结构的Ｎｉ３Ｓｎ

By means of measurement of mechanical and electrical properties, XRD, TEM and SEM, the stress aging of Cu 5Ni 4Sn 3Al alloy was studied.The experimental results showed that the mechanical properties increase with the aging time increasing at 350 ℃. X ray diffraction and TEM observed sidebands and modulated structure in aged alloy, therefore, spinodal decomposition occurred in the Cu 5Ni 4Sn 3Al alloy; the addition of aluminium has no effect on the structure of the alloy, but the effect of aluminium on the mechanical properties of the alloy is great. When spinodal decomposition occurred, DO 22 (TiAl 3 ) type Ni 3 Sn compound phase in the alloy was formed.