时效对Ti-6Al-2.5V合金组织及性能的影响
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摘要
以高真空非自耗电弧炉制备的Ti-6Al-2.5V-1.5Fe-0.15O合金为对象,研究了合金经固溶空冷后,时效温度及时效时间对合金组织演变及力学性能的影响。发现时效温度较低时,α相形核能较低,元素扩散困难,需借助弥散分布的ω相形核,因而针状α相细小而弥散。随时效温度升高,α相形核以及长大驱动力大,时效α相易长大变大。随时效时间延长,时效α相同样变大,未时效的区域减少,合金的屈服强度以及抗拉强度降低,而断裂应变则随之增加。
The effects of aging temperature and aging time on microstructure evolution and mechanical properties of Ti-6Al-2.5V-1.5Fe-0.15 O alloy prepared by high vacuum non consumable arc furnace were investigated after solid solution treatment and air cooling. The results reveal that with a lower aging temperature,nuclear energy ofα is low,leading to diffusion diffuculy of elements,so α nucleation needs the aid of dispersed ω phase,which results in the small and dispersed needle-like α phase. With increasing in aging temperature,driven force of nucleation and growth of α phase are increased,resulting in easy to be grown up of aging phase. With increasing in aging time,the aging α phase is coarsened,and the aging region is increased. After aging treatment,α phase is responsible for the increase of alloy strength. As the aging time increase,the yield strength and the peak strength are decreased,while the fracture strain is increased.
The effects of aging temperature and aging time on microstructure evolution and mechanical properties of Ti-6Al-2.5V-1.5Fe-0.15 O alloy prepared by high vacuum non consumable arc furnace were investigated after solid solution treatment and air cooling. The results reveal that with a lower aging temperature,nuclear energy ofα is low,leading to diffusion diffuculy of elements,so α nucleation needs the aid of dispersed ω phase,which results in the small and dispersed needle-like α phase. With increasing in aging temperature,driven force of nucleation and growth of α phase are increased,resulting in easy to be grown up of aging phase. With increasing in aging time,the aging α phase is coarsened,and the aging region is increased. After aging treatment,α phase is responsible for the increase of alloy strength. As the aging time increase,the yield strength and the peak strength are decreased,while the fracture strain is increased.
引文
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[7]黄金昌.新的低成本钛合金-TI METAL 62S[J].钛工业进展,1995(2):1-3.
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