阻尼性能的影響
(中南大學 材料科學與工程系，長沙 410083)
摘 要: 采用金相顯微鏡、掃描電鏡、XRD及阻尼性能測試等手段研究了添加Sc和Zr對鋅鋁共析合金阻尼性能的影響。結(jié)果表明：0.21%Sc和0.15%Zr使鋅鋁共析合金鑄態(tài)組織顯著細化，阻尼性能提高，阻尼穩(wěn)定性提高；兩種合金Zn-22.1%Al和Zn-22%Al-0.21%Sc-0.15%Zr分別在約208℃和195℃出現(xiàn)內(nèi)耗峰。分析認為Al3Sc及Al3(Sc,Zr)質(zhì)點對α/α， α/β，β/β界面的非彈性粘滯運動的阻礙引起高阻尼，并致使峰位移向低溫。同時，這些質(zhì)點有效地阻止位錯的遷移和亞晶的形成、長大和合并，使阻尼穩(wěn)定性提高。
關(guān)鍵字: Zn-Al合金；阻尼；Sc；Zr
and damping capacity of Zn-22%Al alloy
（Department of Materials Science and Engineering, Central South University,
Changsha 410083, China）
Abstract:The effect of trace Sc and Zr on the internal friction and damping stability of Zn22%Al eutectoid alloy was investigated. The experimental results show that the addition of 0.21%Sc and 0.15%Zr can improve the as-cast structure of the alloy and increase the damping capacity and damping stability of Zn-22%Al alloy. An internal friction peaks were observed about 208℃ and about 195℃ respectively in the present Zn-22.1%Al and Zn-22%Al-0.21%Sc-0.15%Zr alloys. The improvement of the structure and the damping capacity was found to be directly attributed to the precipitation of Al3Sc and Al3(Sc, Zr) phases from the aluminum alloy matrix. The internal friction mechanisms of the alloy were put forward.
Key words: Zn-Al eutectoid alloy; internal friction; Sc; Zr
