摘要
测定了 １３７３ Ｋ退火后的 Ｆｅ—Ｃｒ—Ａｌ和 Ｆｅ—Ｃｒ—Ａｌ－Ｓｉ合金的交换积分、磁晶各向异性常数和饱和磁化强度，根据铁磁学基本原理计算了合金的畴壁能密度和体密度．经过对畴壁不可逆移动物理过程进行分析后认为，铁磁合金中畴壁不可逆移动造成的单位体积内弹性振动能的耗散在量值上等于畴壁能密度，即 γｗ／δｗ＝ Ｅλ_８~２／２．这是铁磁合金中的一种磁弹转换效应．本实验研究的Ｆｅ－Ｃｒ－Ａｌ－Ｓｉ（Ｌ）， Ｆｅ－Ｃｒ－Ｓｉ， Ｆｅ－Ｃｒ－Ａｌ以及 Ｆｅ－Ｃｒ－２Ａｌ－Ｓｉ合金的畴壁能密度依次提高，在 １３７３ Ｋ以上温度充分退火并使晶粒充分长大的条件下。
The magnetic parameters such as exchange integral A, magnetocrystalline anisotropic constant KI and saturation magnetization Ms of Fe--Cr--Al and Fe- Cr--Al--Si alloys annealed at 1373 K were measured. The energy densities and volume fractions of the domain walls (DWs) of these alloys were calculated based on the theory of ferromagnetism and the magnetic parameters measured. The analysis of the physical process of irreversible movement of DWs reveals that the dissipated elastic energy due to the irreversible movements of DWs is equal in value to the energy densities of DWs, that is γW/δW. = λ_SE/2, which is an effect of magneto--elastic interchange in ferromagnetic alloys. The energy densities of DWs of Fe--Cr--Al--Si(L), Fe-Cr--Si, Fe--Cr--Al and Fe-Cr-2Al--Si alloys involved in the investigation are becoming greater one after another, which is the main reason why the internal frictions (damping capacities) of these four alloys annealed at 1373 K--1473 K are becoming higher successively.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期81-86,共6页
Acta Metallurgica Sinica
关键词
铁磁合金
内耗
阻尼性能
磁弹转换
ferromagnetic alloy, internal friction, damping capacity, magneto-elastic interchange
