首页|退火态CFR镁/铝复合板界面形貌与力学性能研究

退火态CFR镁/铝复合板界面形貌与力学性能研究

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通过对波-平轧制镁/铝复合板进行退火处理,研究了退火温度和退火时间对镁/铝复合板界面微观组织和力学性能的影响规律.结果表明,200 ℃/30 min退火平直镁/铝复合板新结合界面生成薄的Mg17Al12相扩散层,这可以促进界面冶金结合,提升界面结合强度.当250 ℃/30 min退火时,新结合界面迅速扩展,进一步形成由Mg17Al12相和Mg2Al3相共同构成的IMCs层.当退火温度升高到300℃时,界面整体形成连续分布的IMCs层,退火温度越高或退火时间越长,IMCs层厚度越大.高温退火处理时,强塑性变形可以加速波谷位置界面原子间的扩散,导致同种化合物波谷位置的生长激活能小于波峰位置,从而造成波谷扩散层厚度大于波峰.退火态镁/铝复合板弯曲测试后,界面无分层、基体无脱落.随着退化温度的升高,平直镁/铝复合板高温拉伸抗拉强度下降,而断裂伸长率增加.
Research on interface morphology and mechanical properties of annealed CFR Mg/Al composite plates
The effect laws of annealing temperature and annealing time on the microstructure and mechanical properties of Mg/Al compos-ite plates interface were investigated by annealing of Mg/Al composite plates manufactured by corrugated-flat rolling.The results show that thin Mg17Al12 phase diffusion layer is formed at the new bonding interface of the flat Mg/Al plates annealed at 200 ℃ for 30 min,which can promote interface metallurgical bonding and improve interface bonding strength.When annealed at 250 ℃ for 30 min,new bonding interface expands rapidly,and further the IMCs layer composed of Mg17Al12 and Mg2Al3 phases is formed.When the annealing tempera-ture rises to 300 ℃,continuous IMCs layer is formed at the whole interface.The higher the annealing temperature or the longer the annea-ling time,the greater the thickness of IMCs layer.Strong plastic deformation can accelerate the diffusion between atoms at the trough posi-tion interface during high-temperature annealing,resulting in the growth activation energy of the same compound at trough position is less than that at the peak position.Therefore,the thickness of the diffusion layer at trough is greater than that at peak.After the bending tests of annealed Mg/Al composite plates,the interface is not stratified and the matrix is not falling off.With the increase of annealing tempera-ture,the tensile strength at high-temperature of flat Mg/Al composite plates decreases,while the elongation at break increases.

Mg/Al composite platescorrugated rollannealing treatmentinterface IMCs layermechanical properties

李莎、楚志兵、桂海莲、李华英、拓雷锋、王涛

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太原科技大学材料科学与工程学院,山西太原 030024

太原理工大学机械与运载工程学院,山西太原 030024

镁/铝复合板 波纹辊 退火处理 界面IMCs层 力学性能

国家自然科学基金国家自然科学基金国家联合基金重点项目子课题山西省基础研究计划(自由探索类)校级博士科研启动基金优秀来晋博士科研项目校级大创项目中央引导地方科技发展资金项目

5217535352204396U22A201882023030212221712022213620232060XJ2023012YDZX20191400002149

2024

10.3969/j.issn.1007-2012.2024.03.017

塑性工程学报
中国机械工程学会

塑性工程学报

CSTPCD北大核心
影响因子：0.46
ISSN：1007-2012
年,卷(期)：2024.31(3)
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