温度对Ni-Al-Cr合金沉淀影响的微观相场模拟  

Microscopic phase-field simulation for the temperature effects on the precipitation of Ni-Al-Cr alloy

作　　者：张济祥[1] 陈铮[1] 来庆波[1] 赵彦[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《兵器材料科学与工程》2009年第4期7-11,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金资助项目(50671084;50875217);中国博士后科学基金项目(20070420218)

摘　　要：基于三元微观相场动力学模型,结合原子图像和体积分数等手段模拟了Ni75Al6Cr19合金在不同温度下的沉淀行为。结果表明:随着时效温度从873 K升高至1 023 K,Ni75Al6Cr19合金由DO22和L12两相共存组织转变为DO22单相组织;受弹性畸变能影响,有序相颗粒沿[100]和[010]方向排列,且时效温度升高,择优取向性愈发显著。平衡时,先析出DO22相的体积分数大于后析出L12相的体积分数。The ternary microscopic phase-field is used in simulating the temperature effects on the precipitation behavior of Ni75Al6Cr19 alloy through atomic pictures and volume fraction.The results show that microstructure of Ni75Al6Cr19 alloy converts from coexistence of DO22 phase and L12 phase to a single DO22 phase with the aging temperature rising from 873 K to 1 023 K.Under the effects of elastic strain energy,the cubic particles exhibit directional alignment along [100] and [010] directions during the late precipitation, which is more obvious at a higher temperature. DO22 phases appear earlier than L12 phases. When equilibrium is reached, the volume fraction of DO22 phase is far larger than that of L12 phase.

关 键 词：Ni-Al-Cr合金 沉淀 体积分数 微观相场 

分 类 号：TG146.15[一般工业技术—材料科学与工程]