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介稳β钛合金通常采用固溶高温时效强化,然而,近年来,一种新的冷变形高温时效强化方法引起了冶金材料工作者的极大兴趣.为此,我们研究了冷变形对介稳βTi一10Mo—8V—3Al—IFe合金高温时效强化和第二相形貌的影响,并对强化机制进行了研究和讨论.研究过程中发现,该合金板材经冷变形高温时效后的强化效果明显高于固溶高温时效强化.当合金冷变形量达到80%后,进行525℃/16h高温时效的强度值比800℃固溶和525℃/16h时效的强度值高出24%,达到1560MPa,而延伸率却没有降低,达到5%左右.为了弄清这一物理现象的本质,用TEM观察了冷变形、冷变形高温时效和固溶时效试样的微观组织.在冷变形试样中看到有许多交叉位错带,带中有堆积位错并形成尺寸为0.25μm的胞状结构,它与晶体结构、位错移动和位错相互作
However, in recent years, a new method of aging strengthening by cold deformation has aroused great interest of metallurgical materials workers.To this end, we studied the effect of cold deformation on metastable βTi-10Mo-8V-3Al-IFe alloy under high temperature aging and the morphology of the second phase, and strengthening mechanism was studied and discussed.It was found during the course of the study that the strengthening effect of the alloy plate after high temperature aging by cold deformation was obvious Which is higher than that of solution aging at high temperature.When the cold deformation of the alloy reaches 80%, the strength of aging at 525 ℃ / 16h is 24% higher than that at 800 ℃ and aging at 525 ℃ / 16h, reaching 1560MPa, While the elongation did not decrease, reaching about 5% .In order to understand the nature of this physical phenomenon, TEM observation of the cold deformation, cold deformation and aging aging solution microstructure of aging specimens in the cold deformation of the sample to see There are many cross-dislocation bands with accumulated dislocations and a 0.25μm-sized cell structure that interacts with the crystal structure, dislocation movement and dislocation