Comparing with the aging state QBe2.0 with a tensile strength of 1150 MPa and fatigue strength of 200 MPa, the tensile strengths of single-crystal (ob=717 MPa) and columnar-grained (ob=361 MPa) Cu-12wt.%Al alloy are 2/3 and 1/3 of that of QBe2.0, while the fatigue strengths (CTN =413 MPa and 303 MPa) are twice and 1.5 times, respectively. The data of some commercial high-aluminum bronze and beryllium bronze also list in Table 2 for comparison. The tensile strengths and fatigue limits of Cu-12wt.%Al alloys prepared in this paper are summarized in Table 2. The relations between omax and Nf can obtain by fitting the data in Fig.4 using Eq.2 and the correlation coefficient R also was calculated. Where omax is the maximum stress under which the fatigue cycles can reach a special Nf, crN is fatigue limit, m slope parameter and D is a constant. For single-crystal samples, the elongation was 8.7% and the tensile strength reached to 717 MPa, which was 2.2 times as much as that of conventional polycrystalline samples (104, the S-N curve can be fitted by three-parameters power function, i.e., The results of tensile tests indicated that single-crystal and columnar-grained samples had better mechanical properties comparing with the conventional polycrystalline sample. In this paper, the tensile mechanical properties and fatigue strengths of single-crystal and columnar-grained polycrystalline Cu-12wt.%Al alloy rods prepared by Ohno continuous casting (OCC) technology were investigated and compared with those properties of polycrystalline Cu-12wt.%Al alloy prepared by conventional casting. ![]() Key Laboratory for Advanced Materials Processing (Ministry of Education), University of Science and Technology Beijing, Haiyou Huang, Mingjun Nie, Yanyan Luan, Xuefeng Liu and Jianxin Xie Procedía Engineering 27 (2012) 1 686 - 1(593įatigue property of single-crystal and columnar-grained polycrystalline Cu-12wt.%Al Alloys Available online at SciVerse ScienceDirect Comparing with the aging state of QBe2.0 with the tensile strength of 1250MPa and fatigue strength of 200MPa, the tensile strengths of single-crystal and columnar-grained Cu-12wt.%Al alloys were about 70% and 30% of that of QBe2.0, but the fatigue strengths were twice and 1.5 times of that of QBe2.0, respectively. Compared with the conventional polycrystalline sample, the single-crystal and columnar-grained samples had higher fatigue limits, which were 1.6 times and 1.2 times as that of conventional polycrystalline sample. ![]() ![]() The fatigue limits of single-crystal, columnar-grained and conventional polycrystalline alloys measured by up and down method were 413MPa, 303MPa and 256MPa, respectively. For columnar-grained samples, the tensile strength was 380MPa and the elongation reached 24.2%, which was 6.5 times higher than that of conventional polycrystalline alloy (δ=3.7%). For single-crystal samples, the elongation was 8.7% and the tensile strength reached to 717MPa, which was 2.2 times as much as that of conventional polycrystalline samples (σb=332MPa). Abstract of research paper on Materials engineering, author of scientific article - Haiyou Huang, Mingjun Nie, Yanyan Luan, Xuefeng Liu, Jianxin Xie
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |