Mg-Gd-Y系合金中绝热剪切带的特征  

Characteristics of the Adiabatic Shear Bands in Mg-10Gd-2Y-0.5Zr Alloy

作　　者：纪伟[1] 范亚夫[1] 陈捷[1] 乔光利[1] 

机构地区：[1]中国兵器工业集团第52研究所烟台分所,山东烟台264003

出　　处：《稀有金属材料与工程》2009年第4期599-602,共4页Rare Metal Materials and Engineering

摘　　要：通过弹道冲击试验和高温Hopkinson Bar压缩试验研究了Mg-Gd-Y系合金的绝热剪切行为。利用光学显微镜对试验后试样的组织进行观察。结果发现,该合金在两种试验条件下形成两种绝热剪切带。弹道冲击过程中形成的剪切带在光学显微镜下呈白亮色,平均宽度约为10μm,属于白亮带,带内组织的显微硬度明显高于周围基体。白亮带只能在稳定塑性侵彻阶段形成;整个高温Hopkinson Bar压缩过程中只在T=735 K时形成较明显的塑性变形带。远离绝热剪切带源点的裂纹的形成主要是由平行于剪切方向的孪晶引起的。Dynamic compression tests and projectile impact tests were used to investigate the adiabatic shear behavior of Mg-10Gd-2Y-0.5Zr alloy. The microstructural characterization of the post-test specimen was studied by means of optical microscopy. Two kinds of adiabatic shear bands were found in the post-test specimens impacted by spherical bullet and Hopkinson pressure Bar. The bands formed in the process of projectile impact are ＂white＂ bands of width about 10 μm. The microhardness in the ＂white＂ band is obviously higher than that in the matrix. In addition, the ＂white＂ bands come into being only in the stable penetrating stage because of enough strain. Obvious deformation bands can form only at T=735 K in the process of Hopkinson compression. The cracks within a propagating shear band are induced by twins paralleling to the shear direction.

关 键 词：Mg-Gd-Y系合金 绝热剪切带 弹道冲击 高温动态压缩 

分 类 号：TG146.22[一般工业技术—材料科学与工程]