F. Yang
,
C. H. Wu and D. L. Sun School of Materials Science & Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China
金属学报(英文版)
Dimensional stability properties of hot extruded 2024 Al alloy bar in T4 and T6 aging states and dif- ferent extruded directions were investigated by testing micro-yield strength (MYS), stress relaxation resistance (SRR), and dimensional change in thermal cycling and unloading conditions.The results show that micro-plastic deformation resistance in longitudinal(parallel to the axis of the extruded bar) direction is higher than that in transverse(perpendicular to the axis of the extruded bar) direction. Testing in short-term loading condition MYS value corresponding to micro-plastic strain of 1 *10m~(-5)in longitudinal direction is 1.4 times than that in transverse.Compared with the results of MYS and dimensional change in thermal cycling and unloading conditions, the values in T6 state are higher than that in T4 state. Using TEM the microstructures before micro-plastic deformation were observed.The analyses confirm that stability of thermodynamics condition and dislocation results in dimensional stability of the alloy.
关键词:
2024 Al alloy
,
null
,
null
,
null
,
null
熊少敏张青川曹鹏涛肖锐
金属学报
对2024铝合金进行不同温度下的热处理, 得到了一系列具有不同溶质原子浓度的基体及析出相含量的铝合金试样. 将这些试样分别在低温(-100 ℃)和室温(25 ℃)下进行拉伸实验, 分析其锯齿幅值和临界应变随应变率的变化趋势. 结果表明, 溶质原子是 Portevin--Le Chatelier (PLC)效应的必要因素, 单纯的位错切割沉淀相不足以产生PLC效应, 只能影响PLC效应, 并且沉淀相对PLC效应的影响在中等拉伸应变率时表现明显.
关键词:
2024铝合金
,
Portevin--Le Chatelier (PLC) effect
,
magnitude of serration
,
critical stain
,
heat treatment
熊少敏
,
张青川
,
曹鹏涛
,
肖锐
金属学报
doi:10.3321/j.issn:0412-1961.2009.07.020
对2024铝合金进行不同温度下的热处理,得到了一系列具有不同溶质原子浓度的基体及析出相含量的铝合金试样.将这些试样分别在低温(-100℃)和室温(25℃)下进行拉伸实验,分析其锯齿幅值和临界应变随应变率的变化趋势.结果表明,溶质原子是Portevin-Le Chatelier(PLC)效应的必要因素,单纯的位错切割沉淀相不足以产生PLC效应,只能影响PLC效应,并且沉淀相对PLC效应的影响在中等拉伸应变率时表现明显.
关键词:
2024铝合金
,
PLC效应
,
锯齿幅值
,
临界应变
,
热处理
王海超
,
杨化冰
,
刘桂亮
,
孙谦谦
,
刘相法
材料导报
doi:10.11896/j.issn.1005-023X.2016.20.018
研究了 Al-5Ti-0.25C细化剂对2024铝合金铸态显微组织及力学性能的影响。试验结果表明：未添加细化剂时,2024铝合金显微组织呈粗大的枝晶状,平均尺寸约为150μm；添加 Al-5Ti-0.25C 后,晶粒为细小的等轴晶。本试验条件下,最佳的细化剂添加量为0.3%,此时,2024铝合金的平均晶粒尺寸为56μm,其力学性能得到显著提高,抗拉强度和延伸率分别为382 MPa、2.60%,与未细化试样相比增幅分别为12.4%、69.9%。
关键词:
Al-5Ti-0.25C细化剂
,
2024 铝合金
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晶粒细化
,
力学性能
