The compression tests were conducted February easily deformable AZ31 alloy rod together with acoustic emission measurement . A rod having a diameter of 3 mm was cut into pieces, then z&#322;&#261;czono them together and sanded to a height of 5 mm. However, because of departures from perpendicularity of the axis of the samples , Scrub yet each separately. The samples were used for investigation of the axial compression deformation . Texture samples was clearly weaker than previous extruded products with an AZ31 , which in combination with the grain uniformity and sphericity explains their increased ductility. Although the texture was lower , still may be considered that the extrusion is a texture characterized by the arrangement of the base planes (0002 ) parallel to the extrusion direction. Its main component was the orientation of the type ( 0002) < 10-10 > . Compression along axis conducive to the formation of twins stretching , at least in the initial stage of crushing . Samples were subjected to ever greater strain with simultaneous measurements of acoustic emission . For this purpose, specially modified to carry out the compression position , respectively, by adding milled and polished sample and the gasket plate of the testing machine . Nine studies were conducted on samples of alloy AZ31 cylindrical shape with the following parameters : the upper surface of the sample - 7.5 mm ², the deformation speed - 0.1 mm / min , room temperature , the maximum stress of about 400 MPa. Traverse testing machine was controlled deformation (constant strain rate ) . Taken three measurements of the total destruction of the sample, which followed the crossing force of 3 kN and a series of measurements involving reaching the point of strength, and then change the sign of strain rate on the opposite . In this way, six samples were deformed before total destruction strength 0.7 , 0.8 , 1.0 , 1.3, 1.8 , 2.4 kN. In the case of acoustic research , for comparative purposes , it was necessary to carry out the calibration measurement on the sleeve of carbon steel. The value of the resultant force ( 90kN ) ensures the resilient nature of the deformation of steel, therefore, to exclude possible errors of interpretation akustogramów magnesium alloys , e.g. due to friction. Examined the nature of the compression curves and comparing them with akustogramami for magnesium alloys and a small change in the dimensions of the sample shows that the deformation took place , and the large peaks in the akustogramach suggest twinning as the main deformation mechanism .