Effect of laser surface remelting on the microstructure and properties of Al-Al2Cu- Si ternary eutectic alloy

被引：20

作者：

Ramakrishnan, Bhupendera Prashanth ^{[1
]}

Lei, Qian ^{[2
]}

Misra, Amit ^{[2
]}

Mazumder, Jyoti ^{[1
,2
]}

机构：

[1] Univ Michigan, Dept Mech Engn, Coll Engn, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Mat Sci & Engn, Coll Engn, Ann Arbor, MI 48109 USA

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

关键词：

HIGH-STRAIN-RATE; HALL-PETCH RELATION; HIGH-STRENGTH; RAPID SOLIDIFICATION; SUPERPLASTIC BEHAVIOR; MECHANICAL-PROPERTIES; ULTRAFINE COMPOSITE; CORROSION BEHAVIOR; YIELD STRENGTH; CU ALLOYS;

D O I：

10.1038/s41598-017-13953-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Bimodal ultrafine eutectic composites (BUECs) exhibit a good combination of strength and plasticity owing to a dual-hierarchy in eutectic length-scales in the microstructure. The present study investigates the variation of phase, morphology, feature length-scales and modality of microstructures obtained in a Al81Cu13Si6 (at. %) ternary alloy after laser surface remelting. A novel approach of varying component bimodal eutectic volume fractions by controlling the cooling rate of the laser solidification process has been presented. The volume fraction of the fine eutectic matrix has a profound effect on the flow strength. Laser remelted microstructures with volume fractions of the fine eutectic varying from 25 to 40% exhibiting compressive flow strengths ranging from 500 to 900 MPa have been obtained. The volume fraction of the fine eutectic decreased with cooling rate and completely ceased to exist at cooling rates greater than 4 x 10(4) degrees C/ s.

引用

页数：10

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