Al-Zn体系高压扭转过程中的相变机理  

Phase Transformation Mechanism of Al-Zn System During High Pressure Torsion

作　　者：陈琛 陈昱林 苏璇 卢璟钰 于俊杰 张建 吉卫喜 CHEN Chen;CHEN Yulin;SU Xuan;LU Jingyu;YU Junjie;ZHANG Jian;JI Weixi(Department of Mechanical Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangnan University,Wuxi 214122,Jiangsu,China;School of Materials Science&Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]江南大学江苏省食品制造装备重点实验室,江苏无锡214122 [3]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《材料导报》2024年第9期200-205,共6页Materials Reports

基　　金：山东省重大科技创新工程基金项目(2019JZZY020111)。

摘　　要：本工作对常温不互溶的Al-Zn体系进行了高压扭转下的机械合金化研究。将0.03 mm厚的纯Al和纯Zn交替堆叠,在3 GPa的压力下进行50圈的高压扭转处理。结果表明,高压扭转处理的Al-Zn合金中产生两种类型的相变,即晶体到非晶的相变,以及密排六方到面心立方的相变。局部高密度位错可能是Al-Zn合金从晶态转变到非晶态的主要原因,而HCP→FCC相变则归因为密排面原子沿晶界产生的Shockley不全位错的滑动。此外,本工作为深入研究Al-Zn合金的固态相变提供了一种新的途径,为提高铝锌合金的力学性能提供了新的思路。In this work,the mechanical alloying of the immiscible Al-Zn system at room temperature under high pressure torsion was studied.Mechanical alloying via high pressure torsion(HPT)was studied for the immiscible Al-Zn system at room temperature.Stacks of alternating 0.3 mm thick sheets of pure Al and Zn were subjected to HPT processing at a pressure of 3 GPa for 50 revolutions.The results show that two phase transformation occurred in the Al-Zn alloy after HPT process,the phase transformation from crystal to amorphous,and the phase transition from hexagonal close-packed to face-centered cubic.High local dislocation density may primarily accounted for the crystalline-to-amorphous transformation in Al-Zn alloy and the phase transformation is attributed to the sliding of Shockley partial dislocations generated at the Al-Zn grain boundaries.Moreover,this work provides a new approach for the in-depth study of the solid phase transformation of Al-Zn alloys.It may also shed lights on improving the mechanical properties of the HPT processed Al-Zn alloys.

关 键 词：高压扭转 机械合金化 相变 铝锌合金 

分 类 号：TH142.3[一般工业技术—材料科学与工程]