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Effect of Tempered Martensite on Magnetomechanical Damping of Ferritic Matrix Dual Phase Alloys

Junsheng LU Xiaodong LIU Wenjie ZHENG Baorong WU Hui BI Central Iron and Steel Research Institute , Beijing , 100081 , ChinaGuijin WANG Dept.of Materials Science and Engineering , University of Pennsylvania , Philadelphia , PA 19104 , USA

材料科学技术（英）

The influence of the volume fraction of tempered martensite on magnetomechanical damping of the ferritic matrix in dual-phase alloys was studied.The experimental results showed that(1) dual-phase damping alloy is of good combination of strength and toughness: (2)good damping ca- pacity(Q~(-1)≥5.0×10~(-3))can be obtained in dual-phase alloys only when the volume fraction of tempered martensite was controlled properly.The effect of martensite on magnetomechanical damp- ing of the ferritic matrix was analysed.The damping capacity of dual-phase alloys was related to the volume fraction V_m of tempered martensite by Q_~(-1)=Q_~(-1) (1-V_m/1+BV_m)at small vibration strain amplitudes ε_A≤5.0×10~(-6).

关键词: martensite , null , null

Relationship between Magnetomechanical Damping Capacity and Vibration Modes

Junsheng LU Baorong WU Dept.of Alloy Steel , Central Iron and Steel Research Institute Beijing , 100081 , ChinaG.J.Wang Dept.of Materials Science and Engineering , University of Pennsylvania , Philadelphia , PA 19104 , USA

材料科学技术（英）

The mathematical expressions for magnetomechanical damping capacity are presented by applying Smith-Birchak's model in torsion pendulum and cantilever beam.The peak value ψ_p is found to be related to physical parameters and material constants in the form Kλ_s=αψ_pε_p.which can be used to estimate the magnetostrictive constant λ_s from the damping capacity-strain amplitude curve.A good agreement of experimental data and theoretical prediction was observed in HIDAMETS Cr15A13NiCu.

关键词: magnetomechanical damping , null , null , null

Twinning in Intermetallic Compounds Are Long Shear Vectors and/or Shuffles Really Necessary?

F.M.Chu David P.Pope Dept.of Materials Science and Engineering , University of Pennsylvania , Philadelphia , PA 19104 , USA

材料科学技术（英）

In this paper the geometric description and general theory of mechanical twinning are reviewed, the twins in general lattices and superlattices are summarized, and the kinetic process by which mechanical twins form is revisited. A case study of mechanical twinning of HfV2+Nb, (cubic) Laves phase, is presented and the synchroshear of selected atomic layers is proposed to explain the physical process of twin formation. If the twins form in this way, then long shear vectors and / or atomicshuffles are not really necessary.

关键词: twin , null , null , null

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