晶体取向对单晶γ-TiAl合金纳米切削的影响研究

Effect of crystal orientation on nanometer cutting of single crystalγ-TiAl alloy

摘要:

为了研究晶体取向对单晶γ-TiAl合金纳米切削过程的影响，采用分子动力学数值方法对不同切削晶向下的切削力、切削温度、材料去除及晶格结构变化进行分析和探讨，揭示不同的晶体取向对单晶γ-TiAl合金纳米切削质量作用机制。研究结果表明：在纳米切削过程中，随着晶面和晶向的变化，切削力、切削温度、材料去除和晶格结构都会有不同程度的变化；选择(010)晶面作为切削平面时切削力较小，产生的切削热较少，γ-TiAl合金表面加工质量较好，晶格结构转变较少；(010)[100]切削晶向下工件产生的切削热较少且最容易切削，晶格结构转变最少，γ-TiAl合金表面加工质量最优。

Abstract:

In order to study the effect of crystal orientation on the nano-cutting process of single crystal γ-TiAl alloy, molecular dynamic numerical methods were used to analyze and discuss the cutting force, cutting temperature, material removal and lattice structure changes of different cutting crystal directions, revealing different mechanism of crystal orientation on nano-cutting quality of single crystal γ-TiAl alloy. The results show that during the nano-cutting process, the cutting force, cutting temperature, material removal and lattice structure change with the change of crystal surface and crystal direction. When the (010) crystal plane is selected as the cutting plane, the cutting force is smaller, the cutting heat generated is less, the surface processing quality of the γ-TiAl alloy is better, and the lattice structure is changed less. The workpiece in the direction of (010) [100] cutting crystals produces less cutting heat and is the easiest to cut, with the least transformation of lattice structure and the best surface processing quality of the γ-TiAl alloy