目的 对锻态Ti-42Al-9V合金进行单道次和多道次高应变速率轧制,研究2种加工条件下板材的显微组织、变形机理,分析轧制态合金的断裂机理。方法 通过高应变速率轧制技术,探讨了单道次、多道次高应变速率轧制板材的微观组织演变规律和变形机理。结果 Ti-42Al-9V单道次轧制板材主要由针状的β/γ混合组织和块状的α2/γ片层团组成,呈双态组织,在高温下,α相产生了孪晶。多道次板材组织主要由(α/α2+γ)片层团和分布于片层团边界处的残余β相和γ相组成,其组织演化主要与(α/α2+γ)片层团的破碎分解有关,即发生了动态再结晶行为。结论 在单道次高应变速率轧制过程中,块状α相的边界处存在应力集中,容易造成位错堆积,因而动态再结晶往往会优先发生在块状α相的边界处,形成细小的再结晶晶粒。而α2/γ多道次高应变速率轧制板材中的片层团在动态再结晶过程中的变形机制为以下3种方式：片层的球化、孪晶诱发形核、弯曲和扭折。
Abstract
The work aims to conduct single-pass and multi-pass high strain rate rolling processes on forged Ti-42Al-9V alloy and systematically investigate the microstructural characteristics and deformation mechanisms of the sheets under these two processing conditions, along with an in-depth analysis of the fracture mechanisms of the rolled alloy. Through the application of high strain rate rolling technology, the evolution laws of microstructures and the associated deformation mechanisms for both single-pass and multi-pass rolled sheets were thoroughly discussed. In the case of single-pass rolled sheets, the microstructure primarily consisted of a needle-like β/γ mixed structure and blocky α2/γ lamellar clusters, forming a dual-phase structure. Twinning occurred within the α phase at elevated temperatures. For multi-pass rolled sheets, the microstructure was predominantly composed of (α/α2+γ) lamellar clusters, along with residual β and γ phases distributed at the boundaries of these clusters. The microstructural evolution in multi-pass rolling was mainly attributed to the fragmentation and decomposition of (α/α2+γ) lamellar clusters, which led to dynamic recrystallization behavior. During single-pass high strain rate rolling, stress concentration occurs at the boundaries of massive α phases, resulting in dislocation accumulation. Consequently, dynamic recrystallization preferentially initiates at these boundaries, leading to the formation of fine recrystallized grains. The deformation mechanisms of lamellar clusters during the dynamic recrystallization process in multi-pass high strain rate rolled sheets can be categorized into three primary modes of spheroidization of laminates, twinning-induced nucleation, and bending/twisting.
关键词
Ti-42Al-9V合金 /
锻造 /
高应变速率轧制 /
热处理 /
显微组织 /
变形机制
Key words
Ti-42Al-9V alloy /
forging /
high strain rate rolling /
heat treatment /
microstructure /
deformation mechanism
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基金
国家自然科学基金（52271118,52071228）; 国家科技重大专项（2024ZD0703901）; 燕赵黄金台聚才计划骨干人才（教育平台）（HJZD202511）
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