Investigation of the influence of cryogenic-temperature machining on ultrafine-grained chips and machined surface quality of solution-treated aluminum 7075 alloys

被引：0

作者：

Chen, H. ^{[1
]}

Zhang, Y. ^{[2
]}

Jiang, F. ^{[3
]}

Chen, T. ^{[1
]}

机构：

[1] Guangdong Polytech, Sch Intelligent Mfg, Lanshi 2nd Rd, Foshan 528041, Guangdong, Peoples R China

[2] Wuhan Vocat Coll Software & Engn, Sch Automot Engn, Wuhan, Hubei, Peoples R China

[3] Dongguan Univ Technol, Sch Mech Engn, Dongguan, Guangdong, Peoples R China

来源：

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK | 2024年 / 55卷 / 11期

基金：

中国国家自然科学基金;

关键词：

7075; aluminum; cryogenic-temperature orthogonal machining; mechanical properties; microstructure; surface integrity; Aluminiumlegierung; Gef & uuml; ge; kryogene Temperatur; mechanische Eigenschaften; Oberfl & auml; cheng & uuml; te; orthogonale Bearbeitung; MECHANICAL-PROPERTIES; MICROSTRUCTURE; STRENGTH; SHEETS; STABILITY; TRIBOLOGY; DUCTILITY; SEIZURE; BULK; ECAP;

D O I：

10.1002/mawe.202300303

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, cryogenic-temperature formal machining technique was used to process solution-treated aluminum 7075 alloys, the mechanical properties, morphology, and microstructure of machined surface and produced chips are investigated. Results show machining temperature has a huge influence on chip and machined surface morphology, cryogenic-temperature machining chips and machined surfaces possess better surface integrity, chips are continuous and smoother, and machined surfaces are flatter. In contrast, room-temperature formal machining chips exhibit serrated cracks on their free surface and the machined surface produces more serious scaly spines phenomenon. Both cryogenic-temperature and room-temperature samples experience severe deformation, cryogenic-temperature machining alumium 7075 alloys max microhardness has enhanced from 98 HV 0.1 to 174 HV 0.1, and cryogenic-temperature samples' microhardness is higher than corresponding room-temperature samples' microhardness among all machining parameters. Cryogenic-temperature can effectively suppress dynamic recovery thus chips could store more dislocations and then possess smaller ultrafine-grained structures, accounting for higher microhardness. Besides cryogenic-temperature inhibits precipitation of solute cluster and second phase particles and plays a lubrication effect at tool-chip interface, thus cryogenic-temperature machining aluminum 7075 alloys could obtain superior machined surface quality/chip morphology to improve processability. (*: Equal contributi)

引用

页码：1535 / 1548

页数：14