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制备了沿〈1 0 0〉生长的定向凝固 Fe- 6 .5 % Si合金 ,以研究晶界和晶粒取向对定向凝固 Fe-6 .5 % Si弯曲性能的影响 .结果表明 ,晶界并非定向凝固 Fe- 6 .5 % Si最薄弱的部分 ,裂纹可以直接或转向后穿过晶界 ,但不能持续地沿晶界扩展 .所有试样都是以解理方式断裂的 ,解理面是 { 1 0 0 } .晶粒取向对定向凝固 Fe- 6 .5 % Si合金的弯曲性能具有决定性的影响 ,〈1 0 0〉是其中较弱的取向之一 .长度方向平行于〈1 0 0〉的弯曲试样无室温塑性 ,而垂直于〈1 0 0〉的试样具有一定的室温塑性
The directionally solidified Fe-6.5% Si alloy grown along <1 0 0> was prepared to study the effects of grain boundaries and grain orientation on the flexural properties of oriented solidified Fe-6.5% Si. The results show that the grain boundaries are not Directional solidification of the weakest Fe-6 .5% Si portion, the crack can be directly or after the steering through the grain boundary, but can not continue along the grain boundary expansion. All samples are cleaved by cleavage, the cleavage plane is {100}. The grain orientation has a decisive influence on the flexural properties of the solidified Fe-6.5% Si alloy, and <1 0 0> is one of the weaker orientations. The lengthwise direction is parallel to <1 0 0 > Bending specimen without room temperature plasticity, while samples perpendicular to <1 0 0> have some plasticity at room temperature