摘要
利用显微力学探针研究了Ｐ－５５／Ａｌ－０．３４ｗｔ％Ｔｉ连续纤维增强金属基复合材料界面区域的微观力学特性，结果表明，存在一宽度为１５μｍ的界面区域，其模量介于纤维与基体之间，为１２０ＧＰａ左右；硬度高于基体，为３．８ＧＰａ左右。界面区模量的升高是由于界面相的存在和高模量纤维的约束作用。通过同心圆柱力学模型对实验结果进行了分析，在界面区域存在ＣＴＥ残余应力，界面区域基体发生塑变，使残余应力得以松驰，这导致界面区域硬度的升高，并且减少了微裂纹产生的可能性。
The micromechanical properties of P-55/Al-0.34wt%Ti MMC were investigated by mechanical properties microprobe test and a concentric cylinder model. It was found that an interfacial region with 15μm width was presented between the fiber and the matrix. The modulus in this region is about 120GPa, which is between that of the fiber and the matrix, and the hardness is about 3.8GPa, which is higher than that of the matrix. The reason for the increase of modulus in the interfacial region is thought to result from interphase and the constraint effect of the high modulus fibers. We considered that there is CTE residual stress in the interfacial region, the stresses are relaxation by plastic deformation and result in the increase of hardness, this is better from the crack resistance viewpoint
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
1997年第5期3-6,,11,,共5页
Ordnance Material Science and Engineering
基金
国家自然科学基金
新金属材料国家重点实验室资助
关键词
连续纤维
金属基
复合材料
界面区域
mechanical properties microprobe, continuous fiber, MMCs, interfacial region, CTE residual stress.
