当前位置: X-MOL 学术Acta Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Tunability of martensitic behavior through coherent nanoprecipitates and other nanostructures
Acta Materialia ( IF 9.4 ) Pub Date : 2018-08-01 , DOI: 10.1016/j.actamat.2018.05.017
Samuel Temple Reeve , Karthik Guda Vishnu , Alexis Belessiotis-Richards , Alejandro Strachan

Abstract Molecular dynamics simulations show that coherent precipitates can significantly affect the properties of martensitic transformations in Ni63Al37 alloys. The precipitates, consisting of non-martensitic Ni50Al50, modify the free energy landscape that governs the phase transformation and result in a significant reduction of the thermal hysteresis, at comparably minor expense of transformation strain, and modification of transformation temperatures. Importantly, this paper shows that free energy landscape engineering is possible with nanostructures potentially accessible through standard metallurgical processing routes. The atomistic-level nucleation and transformation mechanisms within the nanoprecipitate systems are explored and compared with epitaxial nanolaminates and nanowires. The simulations reveal three distinct regimes of transformation mechanisms and martensitic nanostructure as a function of volume fraction of the non-martensitic phase. Free energy landscape engineering is generally applicable and could contribute to the design of new shape memory alloys with novel properties, such as light weight alloys that operate at room temperature.

中文翻译:

通过相干纳米沉淀物和其他纳米结构调节马氏体行为

摘要 分子动力学模拟表明,相干析出物对Ni63Al37合金的马氏体相变性能有显着影响。由非马氏体 Ni50Al50 组成的析出物改变了控制相变的自由能图谱,并导致热滞后的显着降低,而转变应变和转变温度的改变则相对较小。重要的是,本文表明自由能景观工程是可能的,纳米结构可能通过标准冶金加工路线获得。探索了纳米沉淀系统内的原子级成核和转变机制,并与外延纳米层压板和纳米线进行了比较。模拟揭示了三种不同的转变机制和马氏体纳米结构作为非马氏体相体积分数的函数。自由能景观工程普遍适用,有助于设计具有新颖性能的新型形状记忆合金,例如在室温下工作的轻质合金。
更新日期:2018-08-01
down
wechat
bug