陈宗宁

个人信息Personal Information

教授

博士生导师

硕士生导师

任职 : 大连理工大学宁波研究院

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:材料科学与工程学院

学科:材料加工工程

办公地点:大连理工大学主校区铸造中心401室
宁波市江北区育才路26号大连理工大学宁波研究院

电子邮箱:znchen@dlut.edu.cn

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Enhanced strength-ductility synergy in a boron carbide reinforced aluminum matrix composite at 77 K

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论文类型:期刊论文

发表时间:2020-03-25

发表刊物:JOURNAL OF ALLOYS AND COMPOUNDS

收录刊物:EI、SCIE

卷号:818

ISSN号:0925-8388

关键字:B4Cp/6061Al composite; Strengthening mechanism; Deformation; Strength-ductility synergy; Cryogenic temperature

摘要:In the present work, the tensile properties and strength-ductility synergy of a B4Cp/6061Al composite prepared by powder metallurgy were investigated at 77 K. The results demonstrated that as the tensile test temperature was decreased from 298 to 77 K, the yield strength, ultimate tensile strength, and strain to failure of the peak-aged 5 wt% B4Cp/6061Al composite increased from similar to 340 to similar to 380 MPa, similar to 389 to similar to 487 MPa, and similar to 11.9% to similar to 15.6%, respectively; similar trend in the unreinforced 6061Al alloy was observed. The strain hardening capability of the composite exhibited a notable increase at 77 K, suggesting a better resistance to deformation at 77 K. The grains with prestored dislocations and recrystallized grains, which were responsible for the increase in tensile strength and ductility at 77 K, were found in the composite. The matrix strengthening and dislocations generated around the B4C particles resulted in the enhancement of the yield strength of the composite at 77 K. This work provides a reference for the potential application of ceramic particle-reinforced aluminum matrix composites under cryogenic environments. (C) 2019 Elsevier B.V. All rights reserved.