基于Ti元素添加的A356铝合金成型工艺影响分析

Influence Analysis of A356 Aluminum Alloy Forming Process Based on Ti Element

基于A356铝合金固态成型工艺,针对航空机器人的外壳A356铝合金进行加工设计,添加钛元素可有效降低铁元素的含量,富铁相的数量也得到有效控制,复合材料中针状β富铁相逐渐转变为α富铁相,同时富铁相的尺寸显著降低;抗拉强度、屈服强度大幅提升,塑性也有所增强。研究表明,随着钛元素的增加,合金的晶粒得到了明显的细化,当超过一定值时,细化效果明显下降,在进行半固态等温处理时,富铁相的宽度和长度都随着温度的升高先增大后变小;晶粒尺寸也随着温度的升高先减小后增大。随着等温时间的延长,富铁相长度和宽度有所增大;延长等温时间或添加细化剂,未熔初生相的球化呈现明显趋势。

In view of the aluminum alloy is good process performance,based on the research,on the basis of A356 aluminum alloy solid forming for air processing for the A356 aluminum alloy shell of the robot design,adding titanium can effectively reduce the content of iron,to effectively control the number of iron-rich phase,acicular beta iron-rich phase in the composites gradually transformed into Chinese characters shape alpha iron-rich phase,at the same time,the size of the iron-rich phase decreased significantly;Tensile strength,yield strength increased significantly,plastic also increased.The results show that,with the increase of titanium element,the grain size of the alloy is obviously refined,and when it exceeds a certain value,the refining effect is obviously decreased. In the semi-solid isothermal treatment,the width and length of the iron-rich phase increase first and then decrease with the increase of temperature.The grain size also decreases first and then increases with the increase of temperature.With the extension of isothermal time,the length and width of the iron-rich phase increase.The spheroidization of the unmelted primary phase showed an obvious trend when the isothermal time was prolonged or the refiner was added.