不同热处理温度下薄壁纯铜管的Goss织构演变规律

Evolution of Goss texture in thin-walled copper tube at different heat treatment temperatures

采用电子背散射衍射(EBSD)及拉伸试验等方法研究薄壁铜管在热处理过程中显微组织、织构及力学性能的演变规律。结果表明:初始拉拔态铜管组织中以Copper和Y型织构为主,随着温度升高逐渐转变为强烈的Goss型织构。通过高分辨显微组织表征手段可以发现,具有Goss取向的再结晶晶粒分别以不同的机制在Copper取向和Y取向变形晶粒中形核和长大。随着温度的升高,薄壁铜管的抗拉强度逐渐降低,而伸长率受晶粒尺寸和织构组分的共同作用呈先升高后急剧降低的变化趋势。

The evolution of microstructure,textures,and mechanical properties of thin-walled copper tube during heat treatment was investigated using EBSD technique and tensile test.The results show that the initial deformation textures of pre-drawn thin-walled copper tube are mainly composed of Copper and Y components,while with the increase of temperatures,the textures are transformed into a strong Goss texture gradually.The high-resolution microstructural characterizations indicate that the new Goss recrystallized grains nucleate and grow up within the deformed Copper grains and Y grains in different mechanisms,respectively.The tensile strength of the thin-walled copper tube decreases gradually with the increase of the temperature,while the elongation increases first and then decreases sharply due to the action of grain sizes and texture components.