Cgp법에 의한 고강도 초미세립 알루미늄 합금 판재의제조방법

Method of Fabricating High Strength Ultrafine Grained Aluminum Alloys Plates by Constrained Groove Pressing(CGP)

Abstract

본 발명은 합금성분 및 치수 변화없이 강도가 우수한 알루미늄 합금 판재를 제조하는 방법에 관한 것으로서, 더욱 상세하게는, 알루미늄 합금 판재에 비대칭 요철 다이 및 평 다이를 사용한 강한 소성가공을 행함으로써 미세조직을 고경각 입계의 직경 1㎛ 이하의 결정립으로 만들어 합금성분 및 칫수 변화없이 고강도 초미세립 금속 판재를 제조하는 방법을 제공한다. 본 발명의 방법에 따르면, 기존의 ECAP 혹은 STS에 의해 제조 불가능한 고경각 입계의 직경 1㎛ 이하의 결정립을 갖는 초미세립 알루미늄 합금 판재를 합금성분 및 칫수 변화없이 제조할 수 있어서 강도가 2배 이상 획기적으로 향상된 고강도 알루미늄 합금 판재를 제조할 수 있다.
PURPOSE: A method is provided to manufacture a high strength ultrafine grained metal plate without change of alloy constituents and size by performing CGP using asymmetric irregular die and flat die on an aluminum alloy plate to make fine structure into crystal grains having diameter of 1 micrometer or less of high inclination grain boundaries. CONSTITUTION: In a method for manufacturing a high strength aluminum alloy plate, the method for manufacturing a high strength ultrafine grained aluminum alloy plate comprises the steps of (a) pressing ("irregularity pressing") the aluminum alloy plate using asymmetric irregular dies comprising an upper die on which a plurality of irregularities are repeatedly and uniformly formed, and a lower die on which corresponding irregularities to be overlapped with the upper die are formed; (b) pressing ("flat pressing") the alloy plate from the step (a) without displacement using a flat die; and (c) repeating irregularity pressing of the step (a) and flat pressing of the step (b) by rotating the alloy plate to an angle of 180 degrees so that upper and lower surfaces of the alloy plate from the step (b) are reversed, wherein the pressing is performed at a temperature of an ordinary temperature to 200 deg.C, height of the irregularities is equal to the initial thickness of the plate, an inclined surface angle of the irregularities is about 45 degrees and symmetrical side to side, all of height of the irregularities, width of the upper part of the irregularities and lower surface width between adjacent irregularities are same, and they are the same as the initial thickness of the plate, the pressing is performed at a pressing speed of 20 mm/sec or less, and a series of processing processes of the steps (a) to (c) are performed 4 times or more.

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)

    Title

Cited By (2)

    Publication numberPublication dateAssigneeTitle
    CN-104668395-AJune 03, 2015英业达科技有限公司, 英业达股份有限公司承载板的结构强化方法
    CN-104668395-BSeptember 07, 2016英业达科技有限公司, 英业达股份有限公司承载板的结构强化方法