挤压态Mg-Gd-Y系合金中的绝热剪切带  

Adiabatic Shear Bands in an As-extruded Mg-10Gd-2Y-0.5Zr Alloy

作　　者：范亚夫[1] 纪伟[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,烟台264003

出　　处：《材料导报》2008年第7期110-111,116,共3页Materials Reports

摘　　要：在经钢球高速侵彻后的挤压态Mg-Gd-Y系合金板材中发现有绝热剪切带生成。这些剪切带经腐蚀后在光学显微镜下呈亮白色,平均宽度约为10μm,带内的显微硬度明显高于周围基体,属于典型的绝热剪切带。剪切带只出现在稳定塑性侵彻阶段。整个侵彻过程中只有数条剪切带形成,这表明该合金具有较好的抗热塑失稳的能力。Adiabatic shear bands are discovered in an as-extruded Mg-10Gd-2Y-0. 5Zr alloy sheet subjected to high velocity penetration. Shear bands formed in the penetration process are ＂white＂ bands of width about 10μmm and the microhardness in the band is higher than that in the matrix, which indicates that the bands belong to typical adia- batic shear bands. Adiabatic shear bands can only be formed in the stable penetration stage. Additionally, the number of the bands is very few, which indicates that the Mg-10Gd-2Y-0. 5Zr alloy possesses an excellent resistance to thermomechanical plastic instability.

关 键 词：Mg-Gd-Y系合金 高速侵彻 绝热剪切带 

分 类 号：TB333[一般工业技术—材料科学与工程] TG142.1[金属学及工艺—金属材料]