{'fraction_non_alphanumeric': 0.01636904761904762, 'fraction_numerical': 0.004464285714285714, 'mean_word_length': 5.40952380952381, '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}}
The Influence of Low Temperatures on the Mechanical Characteristics of Aluminium Alloys

Aluminium alloys, widely used in aeronautics, are subject to high temperature fluctuations during short periods of time. The paper studies the behaviour of an alloy of the 7xxx group subjected to repeated cooling and heating. Following the usual heat treatment, the cooling to 70 oC is applied one to three times in succession. The measurement of some mechanical characteristics, following the application of these procedures, revealed the existence of differences in the values. Therefore, determining the behaviour of these alloys subjected to extreme working conditions is useful.