冷轧对β-ZrTiAlV合金形变诱导马氏体相变的影响

Effect of Rolling on Deformation-Induced Martensite Transformation in a Metastable β-ZrTiAlV Alloy

对β-ZrTiAlV合金分别采用室温和液氮低温轧制变形,通过X射线衍射(XRD)、光学显微镜(OM)、背散射电子衍射(EBSD)分析技术,研究轧制温度和轧制变形量对β-ZrTiAlV合金形变诱导马氏体相变及其微观组织演变规律的影响。结果表明,在室温或低温条件下变形后合金组织中都发生了β→α′形变诱导马氏体相变,同时在马氏体α′中产生(10 12)<2110>孪晶,轧制变形量的增加促进相变马氏体的形成和孪晶变体数量的增加,而低温变形则抑制了形变诱导马氏体的形成,但更有利于孪晶的产生。轧制变形量为5%时,形变诱导马氏体以板条状分布于原始β晶粒中,当变形量增至10%后,少数β晶粒完全转变为α′相。

The influence of rolling reduction and temperatures at room and liquid nitrogen on the formation of deformation-induced martensite and microstructural evolution in a β-ZrTiAlV alloy was investigated by X-ray diffraction(XRD), optical microscopy(OM) and electron backscatter diffraction(EBSD) technique. The results indicate that a deformation-induced martensite phase transformation process from body-centered cubic β to closed-packed hexagonal α′ accompanying with(10 12)<2110> twinning in the α′ phase simultaneously occurs. With the increase of rolling reduction, the deformation-induced phase transformation and the volume fraction of martensite variant increase. Nevertheless, lower temperature(liquid nitrogen) results in the inhibition of α′ martensite transformation and the promotion of the(1012)<2110> twinning. When the specimen is subjected to the rolling reduction of 5%, plate-like deformation-induced martensite starts appearing in the equiaxed parent β grains. However, when the rolling reduction increases to 10%, the deformation-induced martensite would be generated fully within some β grains.