添加Cu和T6下Mg_(2)Si/Al复合材料的组织与性能  

Microstructure and properties of Mg_(2)Si/Al composite with Cu and T6

作　　者：程婷 王振成 张莉[1] 伍复发[2] 武晓峰 CHENG Ting;WANG Zhencheng;ZHANG li;WU Fufa;WU Xiaofeng(New Energy Vehicle College,Nanchang Institute of Technology,Nanchang 330108,China;School of Materials Science and Engineering,Liaoning University of Technology,Jinzhou 121001,China)

机构地区：[1]南昌工学院新能源车辆学院,江西南昌330108 [2]辽宁工业大学材料科学与工程学院,辽宁锦州121001

出　　处：《兵器材料科学与工程》2022年第1期18-23,共6页Ordnance Material Science and Engineering

基　　金：国家自然科学基金(51971106);江西省教育厅科技项目(GJJ191094)。

摘　　要：采用铸造法制备原位自生亚共晶Al-10Mg_(2)Si复合材料,研究Cu和T6热处理对该复合材料组织与力学性能的影响。结果表明:适量Cu的添加能显著减小共晶Mg_(2)Si相晶粒尺寸,使其晶体结构由粗大的长条状和汉字状转变为细小的条状和纤维状;同时使针状的β-Al_(5)Fe Si相转变为细小的不规则富Cu颗粒。经T6热处理后,质量分数为1.5%的Cu复合材料中的共晶Mg_(2)Si相完全球化。质量分数为1.5%的Cu添加同时提高了材料铸态下的抗拉强度(R_(m))、屈服强度(R_(p0.2))和伸长率(A),达317、169 MPa和2.3%,比未添加Cu提高了42.2%、24.3%和53.3%;经T6热处理的R_(m)和R_(p0.2)值分别增至332、181 MPa,而A值保持不变。同时,材料由脆性断裂完全转变为韧性断裂。In-situ hypoeutectic Al-10Mg_(2)Si composites were prepared by metal mold casting.The effects of Cu and T6 heat treatment on microstructure and mechanical properties of composites were studied.The results show that the addition of appropriate amount of Cu can significantly reduce the grain size of eutectic Mg_(2)Si phase and change its crystal structure from coarse long strip and Chinese character to fine strip and fiber.At the same time,the needle-likeβ-Al_(5)Fe Si phases transform into fine and irregular Cu-rich particles.After T6 heat treatment,the eutectic Mg_(2)Si phase in the material containing 1.5%Cu is completely spheroidized.The tensile strength(R_(m)),yield strength(R_(p0.2))and elongation(A)of the material with 1.5%Cu addition increase to 317 MPa,169 MPa and 2.3%,which are 42.2%,24.3%and 53.3%higher than those without Cu addition,respectively.After T6 heat treatment,R;and R;increase to 332 MPa and 181 MPa,respectively,while A remain unchanged.The brittle fracture completely transforms into ductile fracture.

关 键 词：Mg2Si/Al复合材料 CU T6热处理 共晶Mg_(2)Si 拉伸性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]