OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 2 2025 a b с d e f Fig. 14. Scratch test results under varying load (0.5 to 30 N) (a, b) and constant load (20 N) (c, d) for cast (a, c, e) and additively manufactured (b, d, f) ZhS6U alloy samples after high frequency impact processing, and mean of coefficient of friction of deformed surface under constant load 20 N (e, f) increasing duration initially results in a gradual increase in friction. After 20 minutes of treatment, the coefficient of friction is slightly lower than that of the 10-minute sample. With an increase in HF impact treatment time of the EBAM alloy, the coefficient of friction gradually increases. The coefficient of friction after 20 minutes of HF treatment is a little less than the one for the sample after 10 minutes of HF treatment. The performed investigations revealed a complex effect of low-frequency (LF) and high-frequency (HF) impact treatment on the structure-property relationships of cast and additively manufactured ZhS6U
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