权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Split-age hardening and temperature dependence of yield stress of chill cast Al-Li-Zr alloys.

冷铸 Al-Li-Zr 合金的分裂时效硬化和屈服应力的温度依赖性。

基本信息

批准号：
03650579
负责人：
FURUKAWA Minoru
金额：
$ 1.34万
依托单位：
Fukuoka University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Experimental studies were made on split-age hardening and temperature dependence of yield stress in the chill cast Al-Li-Zr alloys.Results are as follows.1.Chill cast condition:It is possible to dissolve lmass% Zr in Al by chill casting in a water colled copper mold of 3mm gap.2.Optimum heat treatment condition : The first stage aging at 673K for 1.08x10^6s and the successively second stage aging at 473K for 1.08x10^4s provides a rather increase in the yield stress of chill cast Al-Li-Zr alloys than that by aging only at 473K.3.Temperature dependence of yield stress : The binary Al-Li alloys aged to its peak strength show positive temperature dependence of yield stress. On the other hand,the yield stress of binary Al-Zr alloys decreases monotonically with increasing temperature. With increasing the Zr content of Al-Li-Zr alloy,the negative temperature dependence of the yield stress becomes apparent.4.Observation of strain-induced dislocations by transmission electron microscopy: Dislocations move in pairs cutting through the delta'-Al_3Li particles during deformation at the temperature range showing positive temperature dependence of yield strength in the binary Al_3-Li alloys.Dislocations in the binary Al-Zr alloys by-pass,cross slip or climb over the beta'precipitates in the Al-Li-Zr alloys promote the cross slipping or climing over of dislocations and then make the alloy to deform more easily at elevated temperature.

本文对激冷铸造Al-Li-Zr合金的劈裂时效硬化和屈服应力的温度依赖性进行了实验研究，结果如下：1.激冷铸造条件：在3 mm间隙的水冷铜模中激冷铸造，可以使Zr在Al中固溶1 mass %。2.最佳热处理条件：在673 K时效1.08 × 10^6s的第一阶段和在473 K时效1.08 × 10^4s的第二阶段，使激冷铸造Al的屈服应力有较大的提高。3.屈服应力的温度依赖性：时效至峰值强度的二元Al-Li合金的屈服应力与温度呈正相关。另一方面，二元Al-Zr合金的屈服应力随温度的升高而单调下降。随着合金中Zr含量的增加，合金的屈服应力与温度的负相关性变得明显。4.应变诱导位错的透射电镜观察：在Al_3-Li二元合金屈服强度与温度正相关的温度范围内，位错成对穿过δ ′-Al_3Li颗粒运动，在Al-Zr二元合金中位错绕过δ ′-Al_3Li颗粒，Al-Li-Zr合金中β '相的错移或攀移，促进了位错的错移或攀移，使合金在高温下更容易变形。

项目成果

期刊论文数量（12）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Minoru FURUKAWA,Minoru NEMOTO: "HighーTemperature Deformation Behaviour of AlーLiーZr Alloys." Ccience and Engineering of Light Metals(RASELM'91)Ed.by K.Hirano,H.Oikawa and K.Ikeda Japan Institute of Light Metals.241-246 (1991)

Minoru FURUKAWA、Minoru NEMOTO：“Al-Li-Zr 合金的高温变形行为。”轻金属科学与工程 (RASELM91)Ed.K.Hirano、H.Oikawa 和 K.Ikeda 日本光研究所金属.241-246 (1991)

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Yasuhiro MIURA Minoru NEMOTO Mituhiro KUGA Minoru FURUKAWA: "In-situ Observation at High Temperature of Orowan Loops in Al-Li Alloys" Aluminium-Lithium Ed.by M.Peters and P.J.Winkler DGM Informations-gesellshatfmbH.161-165 (1992)

Yasuhiro MIURA Minoru NEMOTO Mituhiro KUGA Minoru FURUKAWA：“铝锂合金中 Orowan 环的高温现场观察”铝锂版，作者：M.Peters 和 P.J.Winkler DGM Informations-gesellshatfmbH.161-165 (1992)