Two-dimensional domain switching induced tensile fracture in a crack-free lead titanate zirconate ceramics under orthogonal electromechanical loading

Two-dimensional domain switching induced tensile fracture in a crack-free lead titanate zirconate ceramics under orthogonal electromechanical loading
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正交机电载荷下无裂纹钛酸铅锆陶瓷的二维畴转换诱导拉伸断裂

DOI:
10.1063/1.3488820
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发表时间:
2010-09
影响因子:
4
通讯作者:
Li, F. X.
Li, F. X.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li, Y. W.;Li, F. X.

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研究了一种软质锆钛酸铅陶瓷在正交压缩和电加载条件下的畴变现象。当压缩比大于200 MPa时,极化曲线和应变曲线均表明,在垂直于压缩方向的平面内,畴变几乎是二维的。而当压缩强度达到350 MPa,电场反转到负矫顽值时,无裂纹试样沿着垂直于电场的中面发生沿晶断裂。这种不寻常的断裂模式是由于内部拉伸应力所造成的约束二维域切换下正交机电加载。
Domain switching in a soft lead titanate zirconate ceramics were investigated under orthogonal compression and electric loading. It is found when compression is higher than 200 MPa, both the polarization curve and strain curves indicate domain switching is nearly two-dimensional (2D) within planes perpendicular to the compressive direction. While as the compression reaches 350 MPa and the electric field reverses to negative coercive value, intergranular fracture occurs in the crack-free specimen along the midplane perpendicular to the electric field. This unusual fracture mode is attributed to the internal tensile stress caused by constrained 2D domain switching under orthogonal electromechanical loading.
机械载荷下极化 BaTiO3 单晶的畴切换与裂纹扩展之间的相互作用
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