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Strength Evaluation of Aluminum Alloy Bolt by Nano-Indentation Hardness Test

机译:纳米压痕硬度测试法评估铝合金螺栓的强度

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摘要

A high strength aluminum alloy bolt (A 7050, T 7 temper treatment) has been developed by the authors. The bolt has a small grain size in the whole area of the bolt because of the large equivalent strain followed by thermomechanical treatment because a grain refining is considered to be effective for improvement of strength and ductility. As the bolt made of A 7050 has a risk of a brittle fracture in the grain boundary like stress corrosion cracking, each grain should be strengthened the grain inside than the grain boundary in order to improve the stress corrosion cracking resistance further. It has been confirmed that the nano-indentation hardness at each grain inside increased with the increasing equivalent strain in the thermomechanical treatment processing.
机译:作者开发了一种高强度铝合金螺栓(A 7050,T 7调质处理)。由于大的等效应变随后进行热机械处理,因此螺栓在螺栓的整个区域中具有较小的晶粒尺寸,因为认为晶粒细化对于提高强度和延展性是有效的。由于由A 7050制成的螺栓可能会像应力腐蚀裂纹那样在晶界发生脆性断裂,因此,应比晶界增强每个晶粒的内部晶粒,以进一步提高抗应力腐蚀裂纹性。业已证实,在热机械处理过程中,每个晶粒内部的纳米压痕硬度随着等效应变的增加而增加。

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