马存强,侯陇刚,张济山,庄林忠

• 1:首都航天机械有限公司
• 2:北京科技大学新金属材料国家重点实验室

摘要(Abstract)：

对7050铝合金铸锭进行了异速比为1.0、1.2和2.0的异步轧制实验,分析了轧制态及热处理后板材的组织及力学性能。结果表明,异步轧制板材心部变形程度远高于同步轧制板材,剧烈变形导致板材中产生变形带且随着异速比增加剪切带的密度显著增加;经热处理后,异步轧制板材晶粒尺寸比同步轧制减少约30%且分布更加均匀。另外,与小异速比轧制板材相比,大异速比轧制板材经固溶得到均匀细小组织所需的时间显著缩短。力学性能结果表明,异步轧制板材性能得到显著改善,经异速比为1.2异步轧制后的板材其T6态(475℃×1 h+120℃×24 h)强度性能最高(抗拉强度:615 MPa,屈服强度:537 MPa),同时具有优良的塑性(伸长率:15.8%),这主要是由于晶粒细化和均匀组织所致。

关键词(KeyWords)： 异速比;异步轧制;7050铝合金;组织演化;力学性能

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务基金(FRF-TD-12-001)

作者(Author): 马存强,侯陇刚,张济山,庄林忠

DOI: 10.13289/j.issn.1009-6264.2018-0178

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