CAJ | 학술논문

硼酸铝晶须增强6061铝合金基复合材料中的界面反应影响其断口分形维数.该复合材料由压力铸造法制备,采用垂直剖面法分析拉伸断裂断口.当量尺度分别取3-15μm以及1-5μm时,可以在断口上发现分形现象.当量尺度在3-15μm的分形域,其分形维数与材料抗拉强度显著正相关.实验结果表明,随热处理时间的延长,界面反应产物的分布与状态可以改变材料的微观断裂模式,进而影响断口的粗糙度和分形维数,同时决定材料的抗拉强度.而当量尺度为3-15 μm的分形域,其分形维数受热处理程度的影响不很显著.
붕산려정수증강6061려합금기복합재료중적계면반응영향기단구분형유수.해복합재료유압력주조법제비,채용수직부면법분석랍신단렬단구.당량척도분별취3-15μm이급1-5μm시,가이재단구상발현분형현상.당량척도재3-15μm적분형역,기분형유수여재료항랍강도현저정상관.실험결과표명,수열처리시간적연장,계면반응산물적분포여상태가이개변재료적미관단렬모식,진이영향단구적조조도화분형유수,동시결정재료적항랍강도.이당량척도위3-15 μm적분형역,기분형유수수열처리정도적영향불흔현저.
The effect of interface reaction on the fractal dimensions of fracture surface in aluminum borate whisker-reinforced aluminum alloy 6061 composite was investigated. The composite was fabricated by squeeze-casting technique. The fracture surfaces created in tensile test were measured by vertical sectioning method. Fractal phenomena were found in two plots,in which the measuring units were from 3 to 15 μm and 1 to 5 μm,respectively. The relation was established between the tensile properties and fractal dimension with measuring units of 3-15 μm. The results show that the ultimate tensile strength increases while the fracture surface roughness increases with fractal dimension increasing due to the change in fracture mode depending on the degree of interface reaction status induced by heat treatment. But when the measuring units are 1-5 μm,fractal dimension does not change with heat treatment.