In order to investigate the yielding behavior of the newly developed Ni 3 Al-based intermetallic alloy IC10, yield stresses have been measured in tension and compression with different orientations. The specimens were cut from a sheet with different angles inclined from the solidification direction. The inclined angles were taken to be 0 , 22.5 , 45 , 67.5 and 90 . All experiments were conducted at room temperature except for orientation 0 , whose deformation temperatures ranged from 298 to 1273 K. Experimental results show that the yield strength of alloy IC10 has the anomalous behavior which has been observed for other Ll 2 -long-range ordered intermetallic alloys, but it is less pronounced. The abnormalities show the following characteristics: (i) the yield strength increases as the temperature is raised below the peak temperature, (ii) yield strength anisotropy, (iii) tension/compression asymmetry. Compared to Ni 3 Al single crystals, the polycrystalline exhibits some different yielding behaviors which may be due to the high volume fraction of c phase. In order to investigate the yielding behavior of the newly developed Ni 3 Al-based intermetallic alloy IC10, has been measured in tension and compression with different orientations. The specimens were cut from a sheet with different angles inclined from the solidification direction. The These experiments were performed at room temperature except for orientation 0, whose deformation temperatures ranged from 298 to 1273 K. Experimental results show that the yield strength of alloy IC10 has the anomalous behavior which has been observed for other Ll 2 -long-range ordered intermetallic alloys, but it is less pronounced. (i) the yield strength increases as the temperature is raised below the peak temperature, (ii ) to yield strength anisotropy, (iii) tension / compression asymmetry. Compared to Ni 3 Al single crystals, the polycrystalline exhibits some different yie lding behaviors which may be due to the high volume fraction of c phase.