Abstract: Purpose: It was explored fretting resistance titanic alloy VT3-1 (Ti-Al6-Cr2-Mo2,5) after low temperature ionic nitriding in unhydrogen environment. Design/methodology/approach: Small amplitude fretting was initiated by the dynamic contact of ball and flat in the regime of the partial slip on edge of spot of contact. A method differs by simplicity and express determination of fretting resistance, namely areas of destruction by action of fretting for part nominally fixed contact - how the functions of cycles of loading. Findings: As a result of fretting the central region of sticking decreasing, and the edge of areas of fretting are increasing. Practical implications: The method of initiation of small amplitude fretting within bounds of preliminary displacement is offered. On the offered method the destruction of titanic alloys is explored at fretting and influencing of ionic nitriding on fretting. By a computation method the work of forces of friction in the area of wear, which in 5..6 times is less for nitriding titanic alloys, is appraised. Originality/value: A method allows defining reactionary power of nitriding layers for small amplitude fretting.
B I B L I O G R A F I A[1] Y.I. Shalapko, V.V. Gonchar, N.S. Mashovets, Nominal stress of contact as kriterion of fretting - resistance for titanium alloy after ion nitriding, Reliability and life of machines and structured, Issue 24 (2005) 150-156.
[2] N.S. Mashovets, Influence of parameters ionic nitriding the titan on physics-mechanical descriptions of nitriding layer, Herald of aeroenginebulding, No. 3 (2004) 122-125.
[3] S.S. Gorelik, Y.A. Skakov, The Rastorguev L.N. Roentgenography and electron - optical analysis: Studies. manual for the institutes of higher, M.: MISIS, (1994) 328.
[4] Johnson K.L. Surface interaction between elastically loaded bodies under tangential forces. Proc. Roy. Soc. (1955) 531.
[5] A. Zhecheva, W. Sha, S. Malinov, A. Long, Enhancing the microstructure and properties of titanium alloys through nitriding and other surface engineering methods, Surface f Coatings Technology 200 (2005) 2192-2207.
[6] A. Zhecheva, S. Malinov, W. Sha Simulation of microhardness profiles of titanium alloys after surface nitriding using artificial neural network, Surface & Coatings Technology 200 (2005) 2332-2342. 
YADDA/CEON