热处理对Cu-Al-Ni合金阻尼性能的影响

来源期刊：中南大学学报(自然科学版)1991年第5期

论文作者：张建安 刘锦文

文章页码：551 - 555

关键词：铜基合金; 阻尼; 内耗; 形状记忆合金; 衰减

Key words：Cu-based alloys; damping; internal friction; shape memory alloys; attenuation

摘    要：应用低频大应力扭摆内耗仪测量了Cu-14.43Al-3.4Ni(wt%)合金(铸态)的阻尼本领。结果表明,热处理工艺对其阻尼影响显著,空冷处理后合金的阻尼值低,有少量γ₂相析出,中间停留温度(t_b)位于M₂点以上的分级淬火则可增大相变热滞,其阻尼值也成倍提高,但中间停留温度过高导致合金阻尼特性恶化。此外,还研究了分级淬火停留时间的影响。对该合金,本文提出的较佳热处理制度为:850℃ 10min—200℃ 60min—空冷,相应的阻尼值在40×10^-3左右。

Abstract: The damping capacity of Cu-14. 43 Al-3. 4 Ni(wt%) alloy has been measuredby a high stress amplitude torsion pendulum internal friction instrument whichworks at low frequency. It is shown that the influence of heat-treatment onits damping behaviour is very remarkable; the internal damping falls to a lowerlevel and small quantities of γ₂ phase are precipitated from matrix when speci-men have been treated in air cooling. However, step-quenching to a mediumtemperature above M: will enable phase transformation heat-hysteresis to riseand its damping value to double, but if t_b temperature is too high, it will result in a spoiling in damping capacity to this alloy. In addition, the influence of step-quenching rest time on damping capacity has been analysed, in this pa-per. For this alloy, a good heat-treatment process is: 850℃ 10min--200℃ 60min--air cooling and the corresponding damping value is about 40×10^-3.