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利用TEM、室温拉伸等手段研究了不同时效处理制度对某新型第三代铝锂合金微观组织和力学性能的影响。结果表明,时效温度和时间对合金硬度、拉伸强度有明显影响。该铝锂合金时效的主要强化相是球状面心立方δ’相和密排六方T1相。其中δ’相是自然时效主要强化相,随着温度升高和时间延长,δ’相逐渐溶解并开始析出大量针状T1相,使合金硬度和强度显著提高,在170℃时效12 h强度即可达到峰值。
The effects of different aging treatments on the microstructure and mechanical properties of a new third-generation Al-Li alloy were investigated by TEM and room temperature tensile tests. The results show that the aging temperature and time have obvious effect on the hardness and tensile strength of the alloy. The main strengthening phase of the Al-Li alloy aging is spherical faceted cubic δ ’phase and close-packed hexagonal T1 phase. The δ ’phase is the main strengthening phase of natural aging. With the increase of temperature and time, the δ’ phase dissolves gradually and a large number of needle-like T1 phases are precipitated, which leads to the significant increase of the hardness and strength of the alloy. Can reach the peak.