The Application Of The CBED And The GPA In The Study Of The Residual Strain Of The Material

The particle reinforced composites and the high strength Al alloys prepared by spray forming process have shared a brilliant position in our country's development. This paper, through the TEM, made several observation about the particle reinforced Al / Al₂O₃ composites, observed the appearance of the reinforced particle, elaborated the tilting and moving of the HOLZ line between the interface. The transformation of the strain was calculated through the least square method using the distance from the transmission center to the HOLZ line. The GPA software analyzed the GP area in the Al12Zn2.4Mg1.1Cu alloy.The result shows that:1. The strain existing between the interfaces of the composites turned down at first and then turned large, which is concluded as the strain releasing. The residual strain's transformation was among the range of the ideal lattice parameter 0.405nm, the high strain existing closed to the interface demonstrated the high residual strain field. However, the strain turned down afterward with the distance versus the interface increased. That is to say, the strain became low, and then the strain turned high and proved the fact that the specimen was suffered from the pressed strain to the stretched strain, which showed the high strain.2. GPA means the geometric phase analysis, this method treated the GP area in the spray formingAl12Zn2.4Mg1.1Cu alloy and elaborated the residual strain, the analysis showed that the residual strain was lower than the strain around the GP area, that meant that the atoms have a quite good location and the GP area has less dislocation. Because of the dislocation between the atoms in the GP area and the atoms around, the dislocation strain field around the GP area was high.