【摘要】 研究了LY12合金在多种热处理制度下的微塑变抗力 ,发现退火、淬火态的微塑变抗力很低 ,循环态次之 ,时效态最高。在时效过程中析出的S’强化相能显著提高微塑变抗力 ,具有典型峰时效规律。循环处理对低应变下的微塑变抗力有利 ,而对较高应变下的微塑变抗力却不利更多还原

【Abstract】 Microplastic deformation behavior of LY12 alloy under several typical heat treatment conditions has been investigated in this work.The results showed that the resistance to microplastic strain( σ p) of annealed specimens was lower,subsequent was the quenched,the aged and thermal cycled specimens presented higher σ p.During aging treatment the σ p exhibited “peak aging”changing tendency,suggesting that the microyield strength,as conventional yield strength,is also controlled by the dispersed strengthening phase S’.Thermal cycling treatment decreased the resistance to higher magnitude of plastic strain ( σ 10 -4 , σ t),but increased that of lower magnitude of plastic strain ( σ 10 -6 ).更多还原