中国激光, 2020, 47 (1): 0102007, 网络出版: 2020-01-09
α相织构对激光沉积制造TC4合金力学行为影响研究 下载: 1257次
Effect of α Texture on Mechanical Behavior of TC4 Alloy Fabricated by Laser Deposition Manufacturing
激光技术 电子背散射衍射技术 拉伸性能 各向异性 Schmid因子 取向差 laser technology electronic back-scattering diffraction tensile properties anisotropy Schmid factor misorientation
摘要
为探明激光沉积制造TC4合金拉伸性能各向异性产生的机制,对不同取样角度的试样进行拉伸性能测试,并采用电子背散射衍射技术对成形件的晶体取向进行分析。结果表明:90°试样(拉伸试样的长轴方向与水平方向夹角为90°)的延伸率比45°试样高32%,抗拉强度和屈服强度分别低9%和8%;90°试样中的主要织构所对应的Schmid因子值最高,为0.485,外加拉伸应力σ与滑移方向分切应力τ之间的夹角θ为38°,试样首先开动的滑移系为柱面滑移系;45°试样的Schmid因子值最低,为0.415,θ为28°,试样首先开动的滑移系是锥面滑移系;90°试样中小角度晶界的占比最小,为1%,45°试样中小角度晶界的占比最高,为29.2%;90°试样具有最优的塑性,而45°试样具有最高的强度。
Abstract
To investigate the generation mechanism of anisotropy of tensile properties, we tested the tensile properties of samples from different sampling angles and analyzed the crystal orientation of formed parts using electronic back-scattering diffraction. The results demonstrate that the elongation of the 90° sample (angle between the long axis direction of the tensile sample and the horizontal direction is 90°) is 32% higher than that of the 45° sample, and the tensile strength and yield strength are 9% and 8% lower, respectively. The Schmid factor corresponding to the 90° sample's main texture has the highest value of 0.485, and the angle θ between external tensile stress σ and shear stress along the sliding direction τ is 38°. The first moving slip system is a prismatic slip system. The Schmid factor of the 45° sample is the lowest (0.415), and θ is 28°. The first slip system of the sample is a pyramidal slip system. The 90° sample has the smallest proportion of small angular grain boundaries (1%), whereas the 45° sample has the highest proportion (29.2%). Additionally, the 90° sample has optimal plasticity, whereas the 45° sample has the highest strength.
钦兰云, 金子心, 赵朔, 倪家强, 刘艳梅, 杨光. α相织构对激光沉积制造TC4合金力学行为影响研究[J]. 中国激光, 2020, 47(1): 0102007. Lanyun Qin, Zixin Jin, Shuo Zhao, Jiaqiang Ni, Yanmei Liu, Guang Yang. Effect of α Texture on Mechanical Behavior of TC4 Alloy Fabricated by Laser Deposition Manufacturing[J]. Chinese Journal of Lasers, 2020, 47(1): 0102007.