和力學性能的影響
(吉林電氣化高等專科學校， 吉林 132021)
摘 要: 通過測試自然時效和人工時效的強度-時間關(guān)系曲線，以及采用金相顯微鏡、透射電鏡和掃描電鏡觀察， 探討了微量鋯對經(jīng)80℃軋制的Zn-22%Al合金顯微組織和力學性能的影響。結(jié)果表明， 在低于80℃的溫軋溫度下時效時，加0.08%～0.32%Zr和不加Zr的Zn-22%Al合金的強度保持不變。鋯具有細化Zn-22%Al合金的組織并阻礙時效時晶粒長大和等軸程度降低的作用。 鋯還可提高Zn-22%Al合金的強度和時效時力學性能的穩(wěn)定性。在三個不同含鋯量的Zn-22%Al合金中,牶?.18%Zr的合金強度最高,而且最穩(wěn)定。
關(guān)鍵字: Zn-22%Al合金 鋯 時效 力學性能
（Jilin College of Electrification, Jilin 132021, P. R. China）
Abstract:The effects of Zr on the microstructures and mechanical properties of the as-rolled(80℃) Zn-22%Al alloy have been studied by measuring the curves of tensile strength versus ageing time and by means of OM, TEM and SEM. The results show that the strength of?Zn-22%Al-(0.08%~
0.32%)Zr alloys and Zn-22%Al alloy remains constant after ageing below the warm-rolling temperature(80℃), that Zr can refine the microstructure of Zn-22%Al alloy, slow the grain growth and reduce the equiaxial degree during ageing, and that Zr can improve the strength and the stability of mechanical properties of Zn-22%Al alloy. It is found that the Zn-22%Al-0.18%Zr alloy has the highest strength and is the most stable one among three Zn-22%Al alloys tested with different Zr contents.
Key words: Zn-22%Al Zr high damping ageing microstructures
mechanical properties
