Abstract—

The titanium alloy Ti–6Al–4V with strongly nonequilibrium α- and β-phases has been studied for the first time. For this, it was subjected to cross-helical rolling (CHR) at T = 1000°C (above the polymorphic transformation temperature), and then quenched in water in order to partially preserve vanadium in the α-phase, and aluminum in the β-phase. Under active uniaxial tension, the non-equilibrium VT6 alloy was deformed in the absence of strain hardening at room temperature. Alloys treated with CHR below the polymorphic transformation temperature showed traditional parabolic hardening. The non-equilibrium of the VT6 alloy caused a strong increase in its impact toughness at low temperatures down to T = –70°C. The fatigue life of a nonequilibrium alloy has doubled. If the initial alloy has ductile-brittle fracture at low negative temperatures, then the nonequilibrium alloy deforms viscously with all signs of structural turbulence. Structural turbulence in a nonequilibrium alloy manifests itself in the temperature range from 20 to –70°C, during deformation of 3D-printed samples, under conditions of shock separation of diffusion-sintered multilayer VT6 alloy packets.

中文翻译：

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非平衡钛合金Ti-6Al-4V低温冲击载荷下的断口形貌，断裂韧性和结构湍流

摘要-

首次研究了具有强非平衡α-相和β-相的钛合金Ti-6Al-4V。为此，将其在T = 1000°C（高于多晶相转变温度）下进行交叉螺旋轧制（CHR），然后在水中淬火以部分保留α相中的钒和β中的铝。 -相。在主动单轴张力下，非平衡VT6合金在室温下没有应变硬化的情况下发生变形。在多晶相变温度以下用CHR处理的合金表现出传统的抛物线硬化。VT6合金的非平衡性导致低温至T时的冲击韧性大大提高。= –70°C。非平衡合金的疲劳寿命增加了一倍。如果初始合金在较低的负温度下具有韧性脆性断裂，则非平衡合金会发生粘性变形，并带有所有结构紊乱的迹象。在3D打印的样品变形期间，在扩散烧结多层VT6合金包的震动分离条件下，非平衡合金的结构紊流表现在20至–70°C的温度范围内。