This refers to hardening caused by the presence of insoluble second-phase particles, such as oxides or precipitates, in a crystalline matrix. Therefore, regardless of the manner in which the second-phase particles are formed, hardening caused by the dispersion of second-phase particles formed by precipitation is called precipitation hardening. Materials that contain second-phase particles are usually stronger than the matrix, and therefore act as an obstacle to dislocation motion. For this reason, a very large stress must be applied to cause dislocation motion, and the material exhibits high yield strength. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
結晶素地中に,たとえば酸化物や析出物のような固溶しない第二相粒子が存在することによって起こる硬化をいう。したがって,第二相粒子が形成される様式にはよらないが,とくに析出によって形成された第二相粒子の分散による硬化を析出硬化と呼ぶ。素地中に第二相粒子が存在するものは,ふつう素地よりも強いため転位運動の障害となる。このため転位の運動を起こすには非常に大きな応力を加えなければならず,材料は高い降伏強さを示す。
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