{'fraction_non_alphanumeric': 0.011753183153770812, 'fraction_numerical': 0.002938295788442703, 'mean_word_length': 5.119760479041916, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Influence of high frequency pulse current on properties of electroformed nanocrystalline Ni–Mn alloys

Abstract The refinement of the grain size of electroformed deposits is an important way to improve the properties of the deposits. In the present study, Ni–Mn alloys in which the grain sizes approached ∼100 nm or below were electroformed by using a high frequency pulse power supply. The influence of the average deposition current density and pulse parameters on microhardness and tensile properties of the pulse electroformed Ni–Mn alloys was studied. The results show that the current parameters influence the properties of the alloys by changing their Mn content and grain size. With increase in average current density, microhardness and strength of the alloys increase and the elongation ratio decreases because of the increment of Mn content of the alloys and the decrement of grain size of the alloys. A shorter pulse on time and larger duty cycle contribute to higher microhardness and strength of the alloys.