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热型连铸CuAlBe形状记忆合金管接头具有柱状晶组织。为了研究管接头扩径时垂直于柱状晶生长方向的力学性能与组织的各向异性,用热型连铸板状试样模拟了管接头,原位观察和测量了板状试样横向拉伸时10个晶粒的变形。发现各个晶粒的拉伸卸载曲线可分为形状记忆型和超弹性型。不同形状记忆型曲线表明,应力诱发β’和γ’相变。拉伸曲线的多样性表明,柱状晶组织横向拉伸时为马氏体形成和稳定化各向异性、弹性各向异性以及相变滞后各向异性。这些各向异性强烈影响管接头的扩径率及相变滞后。
Thermal continuous casting CuAlBe shape memory alloy pipe fittings with columnar grain structure. In order to study the mechanical properties and the anisotropy of the structure perpendicular to the growth direction of columnar crystal when the diameter of the pipe joint is expanded, the pipe joint was modeled by a hot continuous cast plate specimen. The plate specimen was transversely stretched and observed in situ When the deformation of 10 grains. It is found that the tensile and unloading curves of each grain can be divided into shape memory type and superelastic type. Different shape memory curves show that stress induced β ’and γ’ phase transitions. The diversity of tensile curves shows that martensitic formation and stabilization anisotropy, elastic anisotropy and phase transition hysteresis anisotropy are observed when the columnar grains are stretched in the transverse direction. These anisotropies strongly influence the expansion ratio and the phase change lag of the pipe joint.