The microhardness increases first and then remains at a certain level with the increasing passes, while the route effects on hardness are related to the pass number and the refinement effects.
随挤压次数增加，硬度先增大后保持基本不变，而挤压路径对硬度的影响与挤压次数、挤压后细化效果密切相关。
The microhardness increases first and then remains at a certain level with the increasing passes, while the route effects on hardness are related to the pass number and the refinement effects.
随挤压次数增加，硬度先增大后保持基本不变，而挤压路径对硬度的影响与挤压次数、挤压后细化效果密切相关。
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