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To improve the magnetic and mechanical properties of a Heusler alloy of Ni52Mn24Ga24, iron was doped withsome contents. Single crystals ot the pseudoquateary Heusler alloy of Ni52Mn9Fe15 Ga24 have been synthesizedfor mechanicai and magnetostrictive measurements. The magnetostriction loops and stress-strain curves weremeasured under different coupled magnetic-mechanicai loads. The experimental results show that the brittlenessof the sample is clearly improved and Youngs modulus of 13. 7 GPa is obtained in the [001] direction due to thepart substitution of Fe for Mn. Furthermore, the toughness and Vickers hardness of the sample are also given byuse of the indentation technique.