摘要
对Ni_(40．5)Co_(32．5)Al_(27)合金带材进行三种热处理,分析了不同试样的显微组织,采用微分差热分析测定了马氏体转变温度,用动态热机械谱仪研究了相变及阻尼性能。结果表明：经过1623 K×5h直接水冷获得基体相为竹节状粗大再结晶晶粒；而慢冷(0．5 K／min)到1273K后水冷时析出粗大γ相,快冷(10 K／min)至1273K再水冷则析出较均匀细小的γ相。降温过程中合金带材在马氏体相变区出现阻尼峰,并且阻尼峰随频率降低而升高；马氏体相变结束后,合金带材的阻尼性能随温度降低而继续升高；合金带材的阻尼性能随γ相粗化而增强,并且室温附近超过0．04,有望成为新型阻尼材料。
Ni40. 5 Co32.5 Al27 alloy ribbons were heat treated by 3 different methods. The microstructure was observed by OM. Martensitic transformation temperatures and damping capacities were investigated by differential scanning calorimetry （DSC） and dynamic mechanical spectroscopy （DMS）. A bamboo-liked big size recrystallized grains was formed after water quenched from 1 623 K × 5 h. Uniform fine γ phase deposited out by fast cooling （10 K/min） to 1 273 K and big size γphase deposited out by slow cooling （0. 5 K/min）. A damping peak appeared in the martensitic transformation temperature range of 371 - 415 K in cooling process. The damping peak value increased with the decreasing of oscillation frequency. After complete martensitic transformation, the damping capacity still increased with the decreasing of temperature. The damping capacities of Ni40. 5 Co32. 5 Al27 alloy ribbons increasd with the increasing of grain size and were higher than 0.04 at ambient temperatures. It is indicated that Ni-Co-Al alloy is a promising new damping material.
出处
《机械工程材料》
CAS
CSCD
北大核心
2006年第7期37-40,65,共5页
Materials For Mechanical Engineering
