高压凝固Al2O3/Al-10Si复合材料组织热稳定性及力学性能研究  

Thermal Stability of Microstructure and Mechanical Properties of High Pressure Solidified Al2O3/Al-10Si

作　　者：朱冬冬[1,2] 陈志鹏 董多 王刚[2] 王晓红 张艳衡 Zhu Dongdong;Chen Zhipeng;Dong Duo;Wang Gang;Wang Xiaohong;Zhang Yanheng(Key Laboratory of Air-driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,China;School of Mechanical and Automotive Engineering,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]衢州学院浙江省空气动力装备技术重点实验室,浙江衢州324000 [2]安徽工程大学机械与汽车工程学院,安徽芜湖241000

出　　处：《稀有金属材料与工程》2020年第9期3260-3264,共5页Rare Metal Materials and Engineering

基　　金：浙江省自然科学基金(LY18E010003,LQ20E010003);国家自然科学基金(51801112,51501100,51704001)。

摘　　要：采用高压凝固的方法在不同压力下(3,4,5 GPa)分别制备了Al2O3/Al-10Si复合材料,并分别在160℃保温2,4,6 h的条件下研究了高压凝固Al2O3/Al-10Si复合材料的组织热稳定性以及力学性能转变规律。结果表明:热处理导致高压凝固Al2O3/Al-10Si复合材料α固溶的Si在热激活的作用下脱溶析出,聚集长大形成细小颗粒弥散分布于α相内,形成沉淀强化;160℃热处理后α相固溶的Si析出,过饱和程度下降,材料性能逐渐趋于稳定,在沉淀强化的共同作用下,Al2O3/Al-10Si复合材料抗压强度和压缩率较热处理前均有所上升。而160℃保温4 h的条件下,材料的综合力学性能最好。尤其在5 GPa压力下凝固的Al2O3/Al-10Si复合材料,抗压强度可达到716 MPa。Al2O3/Al-10Si composites were prepared by high pressure solidification at 3,4,5 GPa,and then heat treated at 160℃for 2,4,and 6 h.Thermal stability of microstructure and mechanical properties of the Al2 O3/Al-10 Si composites under high pressure were studied.The results indicate that heat treatment leads to the precipitation of Si particles due to the supersaturation in a phase.The precipitation of Si causes a decrease in supersaturation.The compression strength and ration show a slight increase after heat treatment due to the combination of precipitation strengthening and solid solution strengthening.At 160℃/4 h,Al2O3/Al-10Si composites exhibit the best mechanical properties.After solidified under 5 GPa and heat treatment at 160℃/4 h,Al2O3/Al-10Si composites get the maximum compressive strength which is about 716 MPa.

关 键 词：高压凝固 热处理 组织形貌 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]