LY12CZ铝合金微动损伤及防护技术

分析了LY12CZ铝合金及其铆接／螺接件微动损伤的微观特征以及4种工艺措施对疲劳强度的影响。试验结果表明：LY12CZ铝合金对微动作用十分敏感，容易引起严重的表面损伤。微动作用使铝合金的疲劳强度急剧下降。铝合金经喷丸强化处理后。可将常规疲劳强度提高。并使材料的疲劳性能不受微动作用的影响。涂层—胶粘—干涉组合是防止铆接件产生微动损伤的有效措施；喷丸—涂层—胶粘—干涉组合是防止螺接件产生微动损伤的有效措施。

Research on Micromotional Damage of LY12CZ Aluminium Allay and Protective Technique

This text analyzes the micro features of micromotional damages on LY12CZ aluminium alloy and its riveted/bolted parts, and the effect of 4 kinds of technological processes on the fatigue strength. The test result shows that LY12CA aluminium alloy is rather sensitive to micromotional action, which easily causes serious surface damage to alloy and sharply decreases its fatigue strength. After shot peening, the regular fatigue strength of aluminium alloy can be increased and the effect of micromotion on fatigue performance of ther material can be avoided. The combination of coating, adhesive and interference is the effective measure to avoid micromotional damage to riveted parts; while the combination of shot peening, coating, adhesive and interference is the effective measure to avoid micromotional damahe to bolted parts.